单项选择题

A．It was based on the lecture material.
B．It was very easy.
C．It was based on the book.
D．It was very difficult.
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单项选择题
A．takeB．dropC．cutD．hold
A．take
B．drop
C．cut
D．hold
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A．had been expressedB．expressedC．having been expressedD．being expressed
A．had been expressed
B．expressed
C．having been expressed
D．being expressed
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