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

D. as much
单项选择题
______ with the size of the whole earth, the highest mountain does not seem high at all.
A. When compared


B. Compare
C. While comparing

D. Comparing
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