单项选择题

I think it's high time we ______ measures to protect the environment.

A．took
B．will take
C．take
D．have taken
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单项选择题
The shirt ______ was very expensive.
A．bought last week
B．he bought week
C．which he bought it last week
D．he bought last week
单项选择题
______ what to do, he went to the manager for help.
A．Not to know
B．Not knowing
C．Not having known
D．Having not known
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