If I hadn’t stood under the ladder to catch you when you fell, you ____ now.

A．wouldn’t be smilingB．couldn’t have smiled
C．won’t smileD．didn’t smile

A

解析試題分析：考察錯(cuò)綜條件句。本題的條件句中是與過(guò)去的事實(shí)相反，故使用過(guò)去完成時(shí)，主句是與現(xiàn)在的事實(shí)相反，故使用“情態(tài)動(dòng)詞+動(dòng)詞原形”；句意：如果在你摔倒的時(shí)候，我不在梯子后面扶著你，你現(xiàn)在就不會(huì)這樣笑了。故A正確。
考點(diǎn)：考察虛擬語(yǔ)氣
點(diǎn)評(píng)：條件句的虛擬語(yǔ)氣是考查的重點(diǎn)。如果過(guò)去事實(shí)相反，條件句中使用過(guò)去完成時(shí)，主句使用“情態(tài)動(dòng)詞+have done”;如果主句與現(xiàn)在事實(shí)相反，條件句中使用過(guò)去時(shí)，be動(dòng)詞使用were,主句中使用“情態(tài)動(dòng)詞+動(dòng)詞原形”；如果與將來(lái)事實(shí)相反，條件句中有三種：過(guò)去時(shí)；were to do ;should+動(dòng)詞原形，主句使用“情態(tài)動(dòng)詞+動(dòng)詞原形”；要特別注意如果省略了if，句子要使用部分倒裝的形式，把助動(dòng)詞，be動(dòng)詞，情態(tài)動(dòng)詞提之主語(yǔ)前。另外還要注意條件句和主句不同的時(shí)間所形成的挫折條件句。

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