单项选择题

______ many times, this radio receiver is found very sensitive.

A．Being tested
B．Having been tested
C．Having tested
D．Testing
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单项选择题
The older worker and the young each ______ their own tools.
A．have
B．has
C．are having
D．is having
单项选择题
Whereas sudden great disasters are instantaneous, others, such as droughts, are ______.
A．cumulative
B．formidable
C．eternal
D．prospective
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