______ at the door before you enter my room, please.A．Knock B．KnockingC．KnockedD - 高中英语试题 - 超级试练试题库

题目

题型：不详难度：来源：

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

A．Knock

B．Knocking

C．Knocked

D．To knock

答案

解析

考察句式结构。考生若能识别before是状语从句连接词，便可想到空格位置应该是主句部分的谓语，只有A项符合条件。祈使句考点常混在选项是非谓语动词的题中，常考点还有：祈使句，and/or sb. will…。如Study hard, and you will pass the exam. / Study hard, or you will fail the exam.句意：麻烦您进我屋之前先敲门。

核心考点

试题【______ at the door before you enter my room, please.A．Knock B．KnockingC．KnockedD】；主要考察你对动词及动词短语辨析等知识点的理解。[详细]

举一反三

Rod loves clocks. However, he never manages to put them together again.

A． taking apart	B． giving away
C． making up	D． turning off

题型：不详难度：| 查看答案

New ways have been found to prevent the river ______.

A．not to be polluted	B．against polluting
C．from polluting	D．from being polluted

题型：不详难度：| 查看答案

The engine of the ship failed and the bad weather ______ the helplessness of the crew at sea.

A．added to

B．devoted to

C．attended to

D．turned to

题型：不详难度：| 查看答案

In our country the cold weather in the north_____ sharply _____the hot weather in the south.

A．combines；with

B．relates；to

C．compares；with

D．contrasts；with

题型：不详难度：| 查看答案

Mr. Black is a careful and experienfed engineer, so he is often _____ to finish some challenging tasks.

A．appreciated

B．approached

C．appointed

D．agreed

题型：不详难度：| 查看答案

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