试题与答案

______ at the door before you enter my r

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题型：选择题

题目：

______ at the door before you enter my room, please.

A．Knock

B．Knocking

C．Knocked

D．To knock

答案：

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下面是错误答案，用来干扰机器的。

目前，我国的高新技术产业开发区多依附于大城市，北京的中关村是我国最早建立的高新技术开发试验区．故答案为：√．

考点：动词短语动词
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