—Can you guess if they ________tomorrow? —They will come if they ________free,
题型：不详难度：来源：
—Can you guess if they ________tomorrow?
—They will come if they ________free, I think.| A．come; will be | B．will come; will be | C．come; are | D．will come; are |
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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 ... but | B．Either ... or | C．Neither ... nor | D．Not only ... but also |
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You shouldn’t keep a pet _______________ you have enough time to care for it. | A．if | B．unless | C．though | D．when |
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–_______________ does a CRH train run? –It runs up to more than 300 km an hour. | A．How long | B．How far | C．How fast | D．How soon |
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| You’d better book the tickets as early as possible, ________ they will be sold out soon. |
A: ________ will we know the results of the test?
B: In a week, I suppose. | A．How much | B．How far | C．How soon | D．How long |
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