______ at the door before you enter my room, please.A.Knock B.KnockingC.KnockedD.To knock-英语

题目简介

______ at the door before you enter my room, please.A.Knock B.KnockingC.KnockedD.To knock-英语

题目详情

______ at the door before you enter my room, please.
A.Knock B.KnockingC.KnockedD.To knock
题型:单选题难度:偏难来源:不详

答案

A
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。

更多内容推荐