When you want to go into the room, you s

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问题选择题

When you want to go into the room, you should _____ the door. [ ]

A. knock on

B. knocking on

C. knocks at

D. to knock at

答案

答案：A

填空题

目前常用的线路复用方法主要有两种，它们是频分复用和（）

改错题

改错，下列各句均有一处错误，请找出并改正。

1. — Whose pen is this? —It’s her.

A B C D ( ) __ ___

2. They don’t have any classes in Saturdays.

A B C D ( ) ____

3. He enjoys swiming in the river in summer.

A B C D ( ) _____

4. — Can you swim? — No, I’m not.

A B C D ( ) _____

5. My friend Tina is thirteen year old

A B C D ( ) _____