Everyone passed the exam.It _________ difficult.A．can’t have beenB．must have be

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Everyone passed the exam.It _________ difficult.

A．can’t have been

B．must have been

C．couldn’t be

D．might have been

答案

解析

略

举一反三

.—Jack fell off a ladder yesterday,but he’s all right.
—He’s lucky;he _________ himself badly.

A．might hurt	B．could have hurt
C．must have hurt	D．should hurt

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.The petrol tank is empty.I _________it up before we left home.

A．had to fill

B．would have filled

C．should have filled

D．could have filled

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I bought the telephone here yesterday but it _________ work.

A．can’t

B．doesn’t

C．wouldn’t

D．didn’t

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.—Jim!Did you have a good time at the party?
—Yes,but I really _________ have because I had a lot of work to do.

A．needn’t

B．mustn’t

C．shouldn’t

D．couldn’t

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The meeting is not over, and you____ not leave.

A．will

B．shall

C．may

D．need

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