单项选择题

A．passed
B．were enough
C．later
D．earlier
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单项选择题
A．had toB．mustn’tC．mustD．didn’t have to
A．had to
B．mustn’t
C．must
D．didn’t have to
单项选择题
A．watchingB．waiting forC．servingD．searching
A．watching
B．waiting for
C．serving
D．searching
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