It must have rained last night ,____ the ground is wet .

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It must have rained last night ,____ the ground is wet .
A.for B.because C.as D.since
正确答案应该是A ,但是我不是很理解.

哈哈,这个我高中老师讲过~
在原因状从里面,有because和for这两个引导词.差别在于for用于“判断的理由”,而because用于表示造成某个事实的原因.
这个题就是这样解释的.
你要注意,前面句子It must have rained last night是一个“推测”,后面跟出的是你做出这个推测的理由.所以是for.
如果用because这个句子就应该改成：the ground is wet ,because it rained last night.
不知道你有没有懂我的意思?这个有点绕~
再问：谢谢啊，你说的我听懂了，不过我还想问一下，as 和since有没有表示判断或者理由的意思？如果有，有什么区别呢？
再答：唔唔~好久没看高中英语了。。。我老师是这样讲的~ 原因状从的引导词有这些个： 1.because,in that =because 2.since , as , now that , considering that, seeing that 3.for 强烈程度 because>for>since>as 后边可以跟句子。 since侧重主句，从句表示显然的或已知的理由,语气比because稍弱，通常置于句首.有一种“既然”的意思，感觉很无奈啊。懂米懂米？？给个例句：Since he asks you, you'll tell him why. 他既然问你，那就告诉他为什么吧 as从句说明原因,主语说明结果.含义与since相同，但语气更弱，没有since正式.

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