单项选择题

Loudspeakers were fixed in the hall so that everyone _______ an opportunity to hear the speech.

A．ought to have
B．must have
C．may have
D．should have
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单项选择题
Tile student said there were a few points in the essay he ______ impossible to comprehend.
A．has found
B．was finding
C．had found
D．would find
单项选择题
It's high time we ______.cutting down the rainforests.
A．stopped
B．had to stop
C．shall stop
D．stop
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