单项选择题

The school board listened quietly as John read the demands that his followers ______ for.

A. was demonstrating

B. demonstrate
C. had been demonstrating

D. have demonstrated
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Listen to that laughter! They ______themselves.
A. must enjoy



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C. may be enjoying


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Output is now six times ______ it was before liberation.
A. that
B. which
C. what

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