单项选择题

In order to ______ the improved features of the new model dishwasher, the salesman encouraged the customer to operate it by himself.

A．demonstrate
B．exhibit
C．reveal
D．uncover
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单项选择题
By the end of next month we ______ the review on the research findings.
A．will finish
B．will be finishing
C．will have finished
D．have finished
单项选择题
The airplane lost contact with the ground and ______ in the hills.
A．clashed
B．crushed
C．smashed
D．crashed
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