讲解英语时态题高手帮我讲解几道英语时态上的错题,为什么选此答案?两个空的都要说明.1.when i was at col

讲解英语时态题
高手帮我讲解几道英语时态上的错题,为什么选此答案?两个空的都要说明.
1.when i was at college i ( ) three foreign language,but i ( ) all except a few words of each.
A:spoke;had forgotten B:spoke;have forgotten
C:had spoken; had forgotten D:had spoken; have forgotten
2.the students ( ) busily when Miss Brown went to get a book she ( ) in the office.
A:had written; left B:were writing; has left
C:had written; had left D:were writing; had left
3.i need one more coin before my collection ( ).
A:has completed B:completes C:has been completed
D:is completed
4.when and where to build the new factory ( ).
A:is not decided B:are not decided C:has not decided
D:have not decided
5.i ( ) 10 minutes to decide whether i should reject the offer.
A:gave B:was given C:was giving D:had given
6.Great changes ( ) in the city,and a lot of factories( ).
A:have been taken place,have been set up
B:have taken place,have been set up
C:have taken place,have set up
D:were taken place,were set up Great
7.she set out soon after dark ( ) home before middle night.
A:arriving B:to arrive C:having arrived D:and arrived
8.do you remember( ) he came?
A:how B when C that D if