单项选择题

The girl was heard ______ upstairs.

A．to sing
B．sing
C．singing
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单项选择题
They said they would let us know if they ______ any news about the car.
A．will hear
B．heard
C．hear
单项选择题
John will not listen to you ______ you are right.
A．whether
B．since
C．unless
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