单项选择题

The star has been playing basketball（）he was a boy.

A. during
B. when
C. since
D. as

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单项选择题
You（）leave now, because there is an all-night bus.

A. mustn't
B. don't have to
C. aren't able to
D. can't
单项选择题
She is looking forward to（）you. Please write to her soon.

A. hearing from
B. hearing of
C. writing to
D. writing for
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