单项选择题

He __________ his homework when his mother came back yesterday evening.

A．was doing
B．is doing
C．did
D．does
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单项选择题
enough time to study, I would have been able to enter university.
A．Have I
B．I have
C．Had I
D．I had
单项选择题
That's __________ really like.
A．what war is
B．what is war
C．which is war
D．which war is
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