单项选择题

Clearly, if we ______ in the class we must communicate with our classmates.

A．participate
B．are to participate
C．will participate
D．do participate
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单项选择题
You ______ Donna to tell her the news yesterday. I have told her on the phone.
A．needn't write
B．mustn't write
C．needn't have written
D．mustn't have written
单项选择题
It is absurd that one ______ possess two freezes in the room.
A．should
B．could
C．ought to
D．is to
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