What a pity!Considering his ability and experience,he_____be

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What a pity!Considering his ability and experience,he_____better.
A.need have done B.must have done C.can have done D.might have done
My newly-bought cell phone isn't in my bag.Where____ I have put it?
A.can B.must C.should D.would
The biggest problem for most plants,which____just get up and run away when threatened,is that animals like to eat them.
A.shan't B.can't C.needn't D.mustn't

English is a language that many people around the world__not speak perfectly but__at least understand.
A.would...might B.will...must C.might...could D.can...may
---Would you go out for a walk with me
----No,I__.My girl friend is coming.
A.wouldn't B.shall not C.won't D.shouldn't

1、选择B
分析如下：
A、 need have done　本需要做（而事实上没有做）
B、must have done 对过去的事情的推测
C、can/could have done 表推测一般用在否定句和疑问句中,表示不相信或怀疑的态度.
D、might have done　本可以做而没做本来应该（用来表示一种责备）
2、A
can/could have done 表推测一般用在否定句和疑问句中,表示不相信或怀疑的态度.这里是疑问句
should have done 表示“过去本应该做某事却未做.”
3、B can't 表示不能生长

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