几到英语选择题，帮帮忙！！

1 Ten years ___ quite a long time A has B is C have D are
2 who's taken my ruler , Mike ? Tom___ a is b dose c has d did
3 I'll tell him the good news as sn as he ___back. a comes b come c will come d is coming
4 I__letter to my parents last night . a write b wrote c am writing d have written
5 When and where to build the new factory___ yet. a is not decided b are not decided c has not decided d have not decided
答案为b c a b a 请各位高手帮忙给我个解题思路 谢谢！

1. ten years表示一段时间，抽象概念，不可数

2. 问的就是who has taken，所以回答用has

3. 条件状语，用一般现在时，就像if的用法

4. last night，过去时

5. 疑问词引导的不定式做主语，用单数；还没有被决定，用被动，只有a符合

1.B

2.C

3.A

4.B

5.C

B C A B A

D

C

B

B

A

a c a b a