单项选择题

It was very kind of you to help my brother to clean his room, but you（）

A. mustn't have done
B. mightn't have done
C. wouldn't have done
D. didn't have to do

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单项选择题
（）I appreciate your kindness, I must tell you that I can't accept your offer.

A. Even
B. Despite
C. When
D. While
单项选择题
I didn't ask him to do such a hard job. In fact, I don't expect him（）the impossibilities.

A. did
B. to do
C. do
D. does
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