单项选择题

He got up to the roof ______ a ladder.

A．by all means
B．by any means
C．by means of
D．by no means
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单项选择题
She ______ to her teacher for coming to school late.
A．excused
B．apologized
C．pardoned
D．confessed
单项选择题
We tried to ______ the nervous old lady that flying was safe.
A．secure
B．ensure
C．assure
D．certify
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