—Can you guess if they ________tomorrow? —They will come if they ________free,

—Can you guess if they ________tomorrow? —They will come if they ________free,

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—Can you guess if they ________tomorrow?
—They will come if they ________free, I think.
A.come; will beB.will come; will beC.come; areD.will come; are

答案
D
解析

试题分析: 句意:你能猜得出是否他们明天来吗?我想,如果他们有时间会来的。if如果,主句为一般将来时,if引导的条件状语从句用一般现在时代替一般将来时;if是否,引导宾语从句,时态根据实际情况确定,故选D
举一反三
___________ the young girl ___________ her parents take regular exercise in order to keep fit.
A.Not ... butB.Either ... orC.Neither ... norD.Not only ... but also

题型:不详难度:| 查看答案
You shouldn’t keep a pet _______________ you have enough time to care for it.
A.ifB.unlessC.thoughD.when

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–_______________ does a CRH train run? –It runs up to more than 300 km an hour.
A.How longB.How farC.How fastD.How soon

题型:不详难度:| 查看答案
You’d better book the tickets as early as possible, ________ they will be sold out soon.
A.andB.butC.soD.or

题型:不详难度:| 查看答案
A: ________ will we know the results of the test?
B: In a week, I suppose.
A.How muchB.How farC.How soonD.How long

题型:不详难度:| 查看答案
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