单项选择题

When he was sent to interview the mayor, he had ___________ in his stomach.

A. butterflies
B. butterfly
C. butter and fly
D. butter and flies
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单项选择题
Students can be ___________ on themselves in judging such behavior.
A. serious
B. solemn
C. embarrassed
D. hard
单项选择题
He __________ late writing his term paper.
A. stayed out
B. stayed away
C. stayed behind
D. stayed up
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