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In such hot weather,the new plant will have to be protected

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In such hot weather,the new plant will have to be protected from the sun if they _____.
A.are surviving B.survives C.are to survive D.have survived
In such hot weather,the new plant will have to be protected
这句话的大致意思是:这么热的天气里,如果新的植物要存活,就需要免受太阳的伤害.根据意思不可能使用完成时,所以排除D.这是一个if引导的条件状语从句,表目的,故选C,且排除AB.如果不理解或者本人讲解地不清楚,可参照以下例题:In such dry weather,the flower will have to be water if they________.
A.have survived B.are to survive
C.would survive D.will survive
答案:B
选B be to表示目的,将要做某事以达到某目的
如此干旱的天气里,花儿想要存活必须补充水分.A用的过去完成时,显然不对 C和D都是将来时,但这题是个条件句,表示目的的,因此只能选B