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
William told his wife ______.
A．to have his shoes shone
B．to have his shoes shined
C．to have his shoes shining
D．shine his shoes
单项选择题
A．ongoingB．outgoingC．precedingD．underway
A．ongoing
B．outgoing
C．preceding
D．underway
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