单项选择题

He ______ have been nervous because he didn't go straight in.

A. ought to
B. must
C. should
D. had to
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单项选择题
As I regard it, you can widen the ______ of these improvements through your active participation.
A. volume
B. dimension
C. magnitude
D. scope
单项选择题
Once our hens started laying eggs, we had such a ______ of eggs that we were giving many away to our neighbors.
A. output
B. surplus
C. production
D. plenty
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