单项选择题

I don't think it's wise of you to______ your greater knowledge in front of the director, for it may offend him.

A．show up
B．show out
C．show in
D．show off
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单项选择题
The patient's health failed to such an extent that he was put into care.
A．tense
B．rigid
C．intensive
D．tight
单项选择题
He offered to ______ her a hand as the suitcase was too heavy for her to carry.
A．help
B．show
C．lend
D．borrow
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