高中英语情态动词选择题，求详细解释

Question

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

Answer 1

1、选择B
分析下:
A、
need
have
done
本需要做(而事实上没有做)
B、must
have
done
对过去事情推测
C、can/could
have
done
表推测般用否定句和疑问句表示相信或怀疑态度
D、might
have
done
本做而没做
本来应该(用来表示种责备)
2、A
can/could
have
done
表推测般用否定句和疑问句表示相信或怀疑态度里疑问句
should
have
done
表示过去本应该做某事却未做
3、B
can't
表示能生长