单项选择题

—We didn't see him at the lecture yesterday.
—He ______ it.

A．would have not attended
B．can not have attended
C．needn't have attended
D．mustn't attend
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单项选择题
He's working hard for fear that he ______.
A．should fall behind
B．fell behind
C．may fall behind
D．would fall behind
单项选择题
George entered the box and picked up one of the directories inside, ______ that someone unknown had torn out the very page he needed
A．only to discover
B．discovered
C．to discover
D．only discovering
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