单项选择题

You （）your homework lately and your class work isn't up to standard either.

A．didn't
B．weren't doing
C．haven’t been doing
D．won't be doing

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单项选择题
Had Paul received six more votes in the last election, he （）our chairman now.

A. must be
B. would have been
C. shall be
D. would be
单项选择题
Evidence comes up （）specific speech sounds are recognized by babies as young as six months old.

A．what
B．that
C．whose
D．which
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