单项选择题

My little son has not learned how to（）the time yet.

A. see
B. know
C. understand
D. tell

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

A. during
B. when
C. since
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It（）be quite late now, we should go and catch the last bus.

A. can
B. must
C. would
D. may
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