______ it rain tomorrow, we would have to put off the visit to the Water Cube.
A．ShouldB．CouldC．HadD．Were
A

試題分析：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。根據(jù)本句中的tomorrow可知這是與將來事實相反的虛擬語氣，使用should+動詞原形，而且省略了if，構(gòu)成部分倒裝的形式。句義：如果明天下雨，我們就推遲去水立方的參觀。故A正確。
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