搜搜做题作业网______ at the door before you enter my room, please. A．Knock
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| ______ at the door before you enter my room, please.
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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。
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。
______ at the door before you enter my room, please. A．Knock
______ at the door before you enter my room,please.
——at the door before you enter my room A knock B knocking Ck
please knock at the door before you enter the room（同义句转换）
Please knock at the door before you enter the room .(同义句转化))
you should knock at the door before you the room.为什么用enter而不
同义句转换Please knock at the door before you go into the room
you must ____(knock)on the door before you enter
always knock on the door before you enter
You should knock at the door before you you _____ the room.【
改错.Knock before you enter into the room.
Before you_____(enter)the office,you should______(knock)at t