【題目】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】本題考查表語從句。表語從句的成分完整,所以排除D項who這個連接代詞,根據(jù)句意,題干缺少為什么的意思,所以選擇B項why。句意:在這個領域他們有領先的專家,那就是為什么他們?nèi)〉昧酥匾倪M展。

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