if和whether I don't know she will go tomorrow . she

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if和whether I don't know ____ she will go tomorrow .____ she goes ,I ' ll tell you .
I don't know ____ she will go tomorrow .____ she goes ,I ' ll tell you .
A.if ,Whether B.whether ,Whether C.if ,That D.if ,If
if和whether如何区别,这道题如何分析,请详解,

D. if , If
第一个空 whether 和if 都可以,第二个空只能用if
再问：为什么呢？麻烦进一步详解，谢谢。
再答：后面引导的是条件句，如果.....我将.....，这种句型必须用if, 在这里 if 不是“是否”的意思，而是 “如果”的意思。

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