单项选择题

It is essential that we ______ measures to protect the ozone layer.

A) will take
B) should take
C) would take
D) took
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单项选择题
No sooner ______ there than he fell ill.
A) had he arrived
B) he had arrived
C) had arrived he
D) arrived he
单项选择题
The moment has come ______ I can fully display my ability.
A) that
B) which
C) when
D) what
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