单项选择题

The plane ______, its bombs exploding as it hit the ground.

A．smashed
B．clashed
C．struck
D．crashed
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单项选择题
______ that this region was so rich in natural resources.
A．Little he knew
B．Little did he know
C．Little he did know
D．Little he had know
单项选择题
When a machine analyses the frequencies used by a particular voice and draws a graph of them, sound is ______ electronically into a pattern of lines.
A．relieved
B．converted
C．magnified
D．burst
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