单项选择题

He tried his best to ______ some excuse for being late.

A. invite
B. discover
C. find out
D. invent
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单项选择题
It is a kind of ______ plane.

A. out-and-out
B. up-to-date
C. on-the-spot
D. out-of-the-way
单项选择题
The newly-discovered medicine had its ______ only on ordinary colds.
A. effect
B. affect
C. impression
D. influence
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