单项选择题

— Has Jack finished his homework yet
— I have no idea; he ______ it this morning.

A．was doing
B．had been doing
C．has done
D．did
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单项选择题
The two students talked as if they ______ friends for years.
A．should be
B．would be
C．have been
D．had been
单项选择题
He was ______ today, but was asked to stay for ______ week.
A．to have returned; another
B．returning; one more
C．returned; another
D．to return; other
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