单项选择题

What a pity! Considering his ability and experience, be ______ better.

A. needn't have done
B. must have done
C. couldn't have done
D. couldn't have done
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单项选择题
Optimism is a ______ shown to be associated with good physical health, less depression and longer life.
A. trail
B. trait
C. trace
D. track
单项选择题
It is very kind of you to do the washing-up, but you ______ it.
A. mustn't have done
B. shouldn't have done
C. oughtn't to have done
D. didn't have to do
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