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

A．whereB．why

C．whetherD．who

【答案】B

【解析】

試題解析：本題考查表語從句中的連接詞的用法。分析句子，可知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why。故選B。

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