【题目】They have leading experts in this field，and that's __________ they've made important progress．
A．whereB．why
C．whetherD．who
在线课程【答案】B
【解析】
试题解析：本题考查表语从句中的连接词的用法。分析句子，可知表语从句的成分完整，所以排除D 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why。故选B。
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