A man landed on Mars?You must be joking. That__________be true.

A．mustn't

B．won't

C．can't

D．shan't

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参考答案

“can”表推测，可能性，其否定形式为“can’t”意为“不可能”。本句意为：有人登上了火星?你肯定在开玩笑，这不可能是真的。故选C。“mustn’t”意为“将不”；“won’t”意为“将不”；“shan’t”意为“不应该”代入句子中均不合适，故应排除。

1 Can you believe that in__________ a rich country there should be many poor people?

A．such ; such

B．such ; so

C．so ; so

D．so; such

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2 She was so angry that she rushed out into the rain__________I could stop her.

A．before

B．off

C．from

D．away

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3 ——How often do you go to the library?
——__________.

A．In two days

B．Each third day

C．Every a few days

D．Every few days

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