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[John-Doe]

[Крематорий89]

1. A group of scientists are travelling around Africa. How many countries ..... so far, I wonder?
have they visited
have they been visiting
they have visited
do they visit

2. As far as I know Mike ..... Italian for quite some time, but he still doesn’t understand very much.
is learning
has been learning
has learnt
learns
3. Their car is as good as new though they ..... it for a number of years.
have
have been having
are having
have had


choose, and tell why.)

[John-Doe]

IMHO:

A group of scientists is travelling around Africa. How many countries ..... so far, I wonder?
have they visited (present perfect) законченность действия к этому моменту. т. е. они уже их посетили

2. As far as I know Mike ..... Italian for quite some time, but he still doesn’t understand very much.
has been learning (Present Perfect Continuous) действие в недалеком прошлом, которое закончилось или еще продолжается. то есть майк учил довольно долго (может и сейчас продолжает). так же на перфектность указывает обстоятельство времени (for quite some time).

3. Their car is as good as new though they ..... it for a number of years.
have been having тоже самое, что и в п. 2

[Крематорий89]

tnx)
A group of scientists are travelling around Africa. How many countries ..... so far, I wonder?
have they visited<····· правильный ответ
have they been visiting
they have visited
do they visit
As far as I know Mike ..... Italian for quite some time, but he still doesn’t understand very much.
is learning
has been learning<····· правильный ответ
has learnt
learns

Their car is as good as new though they ..... it for a number of years.
have
have been having
are having
have had<····· правильный ответ
( http://www.native-english.ru/exercises/present )

[John-Doe]

what was this for...

[chilly86]

[John-Doe]

странный тест по временам презент, в вариантах ответов которого встречаются конструкции других времен. ну это так, к слову.

вообще, имхо, стоило бы сначала запостить свои ответы и мысли почему так, а потом спросить других где ошибки. так объяснение было бы понятнее.

[Крематорий89]

[Natalie]

Hi there! How are you going? I need some information about the exchange programmes (Au-pair, work and travel)? Who knows something about it? Where are the offices in our town who can give some information about it?

[Серый]

I know that W&T situated in TGATU, my friend went to the USA this summer with the help of this program.