【題目】 They have leading experts in this field, and that's ____ they've made important progress.

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

【答案】B

【解析】

試題分析：本題考查表語從句。句意：在這個領(lǐng)域他們有領(lǐng)先的專家，那就是為什么他們?nèi)〉昧酥匾倪M(jìn)展。表語從句的成分完整，所以排除D 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 why。

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