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 report showed us clearly how the car got ______ and crashed at last.
A．into control
B．under control
C．within control
D．out of control
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