3.-Shall we play basketball on the playground this Saturday afternoon?
-We'll go if it                   .( 。
A.rainsB.will rainC.doesn't rainD.won't rain

分析 ---這周六下午我們?nèi)ゲ賵?chǎng)上打籃球好嗎?
---如果不下雨我們就去.

解答 答案:C.if引導(dǎo)的條件狀語(yǔ)從句,遵循主將從現(xiàn)的規(guī)則,從句主語(yǔ)it,借助于助動(dòng)詞does構(gòu)成否定,故答案是C.

點(diǎn)評(píng) 1.if從句用一般現(xiàn)在時(shí),主句用一般將來(lái)時(shí)  
If he runs  he'll get there in time.如果他用跑的,他就會(huì)及時(shí)趕到那兒. The cat will scratch you if you pull her tail.如果你拉貓的尾巴,它就會(huì)抓你.  
2..if從句用一般現(xiàn)在時(shí),主句用may/might/can 
If the fog gets thicker the plane may/might be diverted.如果霧在大一些,飛機(jī)可能就會(huì)改在別的機(jī)場(chǎng)降落. 
If it stops snowing we can go out.如果雪停了,我們就可以出去.

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