单项选择题

We recognized his voice______ he spoke on the radio.

A．while
B．after
C．in case
D．the moment
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单项选择题
The news reporters hurried to the airport, only______ the film stars had left.
A．to tell
B．to be told
C．telling
D．told
单项选择题
—Is Mrs White in the office—Yes, _ _____she is on duty, she must be there.
A．since
B．until
C．for
D．if
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