单项选择题

The professor raised his voice. He's afraid he can't make himself ______.

A) to be heard
B) heard
C) be heard
D) hearing
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It's high time that the nations of the world ______ manufacturing nuclear weapons.
A) have stopped
B) stop
C) will stop
D) stopped
单项选择题
Hardly had he entered the office ______ the teacher came in.
A) then
B) that
C) than
D) when
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