单项选择题

As the plane flew off towards the mountains in the distance the sound of its engines gradually________ .

A．died away
B．sank down
C．dropped off
D．went out
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单项选择题
The farm produced more food than_________ thought possible during World War II.
A．ever be
B．would ever be
C．has ever been
D．had ever been
单项选择题
The building looks deserted but there‘s _______to be someone on guard there.
A．still
B．simply
C．bound
D．prob
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