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

试题分析:条件句的虚拟语气是考查的重点。如果过去事实相反,条件句中使用过去完成时,主句使用“情态动词+have done”;如果主句与现在事实相反,条件句中使用过去时,be动词使用were,主句中使用“情态动词+动词原形”;如果与将来事实相反,条件句中有三种:过去时;were to do ;should+动词原形,主句使用“情态动词+动词原形”;要特别注意如果省略了if,句子要使用部分倒装的形式,把助动词,be动词,情态动词提之主语前。根据本句中的tomorrow可知这是与将来事实相反的虚拟语气,使用should+动词原形,而且省略了if,构成部分倒装的形式。句义:如果明天下雨,我们就推迟去水立方的参观。故A正确。
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