单项选择题

______ he daydreamed, Peter saw figures in the sky.

A. Until
B. Since
C. While
D. During
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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
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
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