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Our classroom ____ every day.

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Our classroom ____ every day.
△△△丶Our classroom ____ every day.A.must clean B.is clean C.must be clean
D.must be clean
▲▲▲丶这道不是选择题是根据句意写出句子中空缺处单词的正确形式、
1.Mr Wang enjoys ____ by air(travel)
2.If it ____ tomorrow .I will go out.(rain)
3.Mary______ English for six years (learn)
= = = = =
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1.traveling.首先来看第一题,enjoy doing sth 是固定短语.
2.rains.if 引导的条件状语从句在初中阶段涉及到一个原则就是主将从现.主句将来时,从句现在时.
3.has learnt/learned.首先看时间状语是for six years,表明是持续的一段时间.这样的时间状语是完成时态的标志词.确定了时态,再看主语,主语为第三人称单数,因此助动词have要用其单数has的形式.