9.______ will all the measures actually make a difference.(  )
A.If action is takenB.If only action is taken
C.As if action is takenD.Only if action is taken

分析 只有采取行動(dòng),所有的措施實(shí)際上才能起作用.

解答 答案:D.
根據(jù)"will all the measures…"可知,這里使用了部分倒裝,只有"only+狀語(yǔ)(從句)放于句首"時(shí),主句才使用部分倒裝.if only但愿,要是…就好了,as if仿佛,好像;make a difference產(chǎn)生影響,起作用.故選D

點(diǎn)評(píng) only if與only if的區(qū)別:
1.only if 引起的條件狀語(yǔ)從句,是一個(gè)對(duì)"條件"限制更嚴(yán)的從句,表示"只有…(才);只有在…的時(shí)候"的意思;與if引起的一般條件句相比,它有一種增強(qiáng)主句語(yǔ)勢(shì)的作用.例如:
I'll come only if you really need me.只有當(dāng)你真正需要我的時(shí)候,我才來(lái).
2.only if引導(dǎo)的條件句,通常用來(lái)表示說(shuō)話人對(duì)某事所寄予的某種強(qiáng)烈愿望,相當(dāng)于as long as.當(dāng)某事不大可能或完全不可能實(shí)現(xiàn)而感到惋惜或遺憾的復(fù)雜心情,常用虛擬語(yǔ)氣.例如:
If only you had not told Tom what I said,everything would have been all right.要是你沒(méi)有把我 的話告訴湯姆就好了,那樣就不會(huì)出什么問(wèn)題了.

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