Question

4．________ the morning train，he would not have been late for the meeting．（　�。�

• A． Did he catch
• B． should be catch
• C． has he caught
• D． Had he caught

Answer 1

分析 句意：如果他趕上了早班火車，開會就不會遲到了．

解答 答案D．
句意：如果他趕上了早班火車，開會就不會遲到了．主句的謂語動詞是would not have been，說明與過去事實相反，從句則可以用if he had caught the morning train，當(dāng)if從句中有were、had或者should 時，在可以省略if，把were、had或者should放在句首構(gòu)成倒裝句形式．本句中含有had，所以不用if時，就變成了 Had he caught the morning train．故選D．

點評 虛擬條件句省略if后構(gòu)成的倒裝：
當(dāng)if引導(dǎo)的虛擬條件從句中含有had，were，should等時，如將if省略，則要將had，were，should等移到主語前，構(gòu)成倒裝句：
如：Had you come yesterday，you would have seen him．若你昨天來，你就會見到他了．
        Should you require anything give me a ring．如果需要什么，可以給我打電話．
        Were it not for your help，I would still be homeless．要不是你幫助，我會仍然無家可歸．
注：省略if后提前的had不一定是助動詞：
如：Had I money，I would buy it．假若我有錢，我就會買它．