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If the wound ______ become infected, do not hesitate to call me.
A.shallB.mustC.shouldD.would
C

试题分析:考查虚拟语气。本题的条件句是一个与将来事实相反的虚拟语气,使用should+动词原形构成;句意:如果你的伤口被感染,请立刻给我电话。故C正确。
点评: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。
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