单项选择题

The Martian surface temperature is 100 degrees below zero at night, so that butter put outside will not ______.

A．thaw
B．dissolve
C．melt
D．fuse
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单项选择题
______ she realized she was in great danger.
A．No sooner the gangster took out the gun than
B．It was not until the gangster took out the gun that
C．Scarcely had the gangster took out the gun that
D．Hardly did the gangster took out the gun that
单项选择题
If the whole framework of the thesis ______ beforehand, a great deal of time and energy would have been saved.
A．was designed
B．had been designed
C．were designed
D．has been designed
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