单项选择题

Mary showed the (customs) officer her passport, (then) John showed (him) (his one).

A．customs
B．then
C．him
D．his one
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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
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
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