单项选择题

My wallet is nowhere to be found. I______ when I was on the bus.

A. must drop it
B. should have dropped it
C. must have dropped it
D. had dropped it
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单项选择题
What the teacher said had a great ______ on his later career.
A. effort
B. influence
C. result
D. expression
单项选择题
He didn' t know I was in his office. He was too busy to ______ me.
A. pay attention to
B. notice
C. know
D. realize
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