单项选择题

A. I’m not in the office. B. No, I am.
C. I have homework to do. D. I’m a student.
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单项选择题
The time he has devoted in the past years ______ the disabled is now considered ______ of great value.
A. to help; being

B. to helping; to be
C. to help; to be

D. helping; being
单项选择题
Is it true ______ the snow stops, it will be as hot as in the summer here
A. when
B. that when
C. whenever
D. that
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