单项选择题

This book will show the readers ______ can be used in other contexts.

A. how that they have observed
B. how what they have observed
C. that how they have observed
D. that they have observed
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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
单项选择题
Listen to that laughter! They ______themselves.
A. must enjoy



B. must be enjoying
C. may be enjoying


D. can be enjoying
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