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【题目】They have leading experts in this field, and thats ______ theyve made important progress.

A.where B.why C.whether D.who

【答案】B

【解析】本题考查表语从句。表语从句的成分完整,所以排除D项who这个连接代词,根据句意,题干缺少为什么的意思,所以选择B项why。句意:在这个领域他们有领先的专家,那就是为什么他们取得了重要的进展。

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