单项选择题

It's high time that the nations of the world ______ manufacturing nuclear weapons.

A) have stopped
B) stop
C) will stop
D) stopped
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Hardly had he entered the office ______ the teacher came in.
A) then
B) that
C) than
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I think that the movie is worth ______ again.
A) to see
B) seeing
C) saw
D) seen
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