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【题目】They have leading experts in this field, and that’s ____________ they’ve solved this problem successfully.

A.whereB.whyC.whetherD.who

【答案】B

【解析】

考查表语从句。句意:他们在这个领域有领先的专家,这就是为什么他们成功地解决了这个问题。分析句子结构,be动词后面的表语从句的成分完整,所以排除who这个连接代词。句子缺少为什么的意思,所以这里是why引导的表语从句,故选B

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