单项选择题

He tested this（）experimentally, and found that his results were consistent with the idea.

A. detection
B. formula
C. hypothesis
D. statistics

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单项选择题
He is quite worn out from years of hard work. He is not the man（）he was twenty years ago.

A. which
B. that
C. who
D. whom
单项选择题
She would have been more agreeable if she had changed a little bit,（）

A. hadn’t she
B. hasn’t she
C. wouldn’t she
D. didn’t she
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