单项选择题

It's time that we ______ proper measures to protect the environment.

A．take
B．are taking
C．took
D．have taken
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单项选择题
The procedure ______ is written step by step in the manual.
A．follows
B．to follow
C．following
D．have followed
单项选择题
The first-year students were learning from the army in Miyun, a suburb of Beijing near ______ I lived.
A．what
B．where
C．that
D．which
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