单项选择题

51:

A．look
B．watch
C．notice
D．experience
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单项选择题
We recognized his voice______ he spoke on the radio.
A．while
B．after
C．in case
D．the moment
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
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