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求大神解析一道英语选择

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求大神解析一道英语选择
we'll discuss many situations___english beginners fail to use this expression
A.when B.on which C.where D.why
C
定语从句,situation是先行词,原句应为为english beginners fail to use this expression (in the situation)
再问: 麻烦再问一题the reason__they failed was __they didn't get fully prepared for the experiment。 A.which,because B.which,that C.why,that D.why ,because
再答: C前面是定语从句,后面是同位语从句
再问: 为什么第二个不填because呢
再答: 同位语从句中用that连接句子,that无意义