单项选择题

In our class, when the bell rang and the teacher closed his book, it was a () for everyone to stand up.

A．signal
B．chance
C．mark
D．measure

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单项选择题
Would you please keep silent The weather report () and I want to listen.

A．is broadcast
B．is being broadcast
C．has been broadcast
D．had been broadcast
单项选择题
He did not regret saying what he did but felt that he () it differently.

A．could express
B．would express
C．could have expressed
D．must have expressed
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