You _____ cold if you had put on more clothes the day before yesterday.
A．won’t catchB．wouldn’t have caughtC．hadn’t caughtD．haven’t caught
B

試題分析：考查虛擬語氣。本題是條件句中，與過去事實相反的虛擬語氣，主句中使用“情態(tài)動詞+have done”的形式。句意：如果你前天就穿更多的衣服，你就不會感冒了。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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