单项选择题

We tried to keep a ______, but he looked so ludicrous.

A．straight look
B．serious look
C．straight face
D．strict face
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单项选择题
The Gulf war has ______ lately with heavy losses on both sides.
A．flared up
B．conjured up
C．fired
D．put up
单项选择题
When Edison died, it was proposed that the American people ______ all power for several minutes in honour of this great man.
A．turned off
B．turn off
C．would turn off
D．must turn off
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