单项选择题

The young man promised to his parents, "I would never ______ again."

A．let you down
B．let you out
C．let you in
D．let you by
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单项选择题
I believe he ______an accident, otherwise he would have arrived on time.
A．would have had
B．could have had
C．should have had
D．must have had
单项选择题
After saying that, he ______ the door quickly.
A．made up
B．made for
C．made out
D．made
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