单项选择题

We recognized his voice ______ he spoke on the radio.

A．after
B．in case
C．the moment
D．while
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单项选择题
How nice to see you again! You should have told me you ______.
A．are coming
B．were coming
C．will come
D．have come
单项选择题
-- Are we supposed to take off our shoes before we enter -- No, you ______.
A．shouldn't
B．needn't
C．mustn't
D．can't
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