______ it rain heavily tomorrow, we would have to put off the visit to the Forbidden City.
A.WereB.ShouldC.WouldD.Will
B

試題分析:考察虛擬語氣和倒裝。在條件狀語從句中,如果與將來事實相反,條件句中有三種:過去時;were to do ;should+動詞原形,主句使用“情態(tài)動詞+動詞原形”;要特別注意如果省略了if,句子要使用部分倒裝的形式,把助動詞,be動詞,情態(tài)動詞提之主語前。本題就是把if省略,把should提前。句意:如果明天的雨下得很大,我們就不得不不推遲到紫禁城的參觀。故B正確。
點評:條件句的虛擬語氣是考查的重點。如果過去事實相反,條件句中使用過去完成時,主句使用“情態(tài)動詞+have done”;如果主句與現(xiàn)在事實相反,條件句中使用過去時,be動詞使用were,主句中使用“情態(tài)動詞+動詞原形”;如果與將來事實相反,條件句中有三種:過去時;were to do ;should+動詞原形,主句使用“情態(tài)動詞+動詞原形”;要特別注意如果省略了if,句子要使用部分倒裝的形式,把助動詞,be動詞,情態(tài)動詞提之主語前。
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