A man landed on Mars?You must be joking. That_________

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

A．mustn't
B．won't
C．can't
D．shan't

参考答案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”；“shan’t”意为“不应该”代入句子中均不合适，故应排除。

单选题 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

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

A．before
B．off
C．from
D．away

单选题 ——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