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

【答案】C。解析：“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”；“sham’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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