单项选择题

Words 5000 is the only book that（）these words.

A．explain
B．explains
C．to explain
D．have explained

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单项选择题

If I（）harder for the final exam, I should have passed it.

A．study
B．had studied
C．studied
D．was studying

单项选择题

We don't know the woman（）he talked this morning.

A．to whom
B．who
C．to which
D．that

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