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

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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 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 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 from the sun if they _____.A.are surviving B.survives C.are to survive D.have survived
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

be to do 一般是将来要发生的事情
这里就是“如果要使植物成活”的意思。

这句涉及be to do 的用法，首先分析句子的含义，“在这样炎热的天气中，如果它们想要存活就必须保护新生植物免于日晒”。那么它们存活是意愿的事情，用be to do表示，此外，be to do 还有其他意思。如，表示计划去做某事，表示未来要发生的事情等等。而A、B、D选项，显然不符合句意要求，所以当然选C啦！明白了吗？...

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这句涉及be to do 的用法，首先分析句子的含义，“在这样炎热的天气中，如果它们想要存活就必须保护新生植物免于日晒”。那么它们存活是意愿的事情，用be to do表示，此外，be to do 还有其他意思。如，表示计划去做某事，表示未来要发生的事情等等。而A、B、D选项，显然不符合句意要求，所以当然选C啦！明白了吗？

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C
be to survive
be to do 按计划要做
大概意思就是想要他们活，就要防止被晒

这道题选C 因为be to do 表示（1）注定要... 和（2）将来要干什么。显然本文用第一个解释注定要...例如：If you are to succeed, you must work hard.

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