【題目】They have leading experts in this field, and that’s ____________ they’ve solved this problem successfully.

A.whereB.whyC.whetherD.who

【答案】B

【解析】

考查表語從句。句意:他們在這個領(lǐng)域有領(lǐng)先的專家,這就是為什么他們成功地解決了這個問題。分析句子結(jié)構(gòu),be動詞后面的表語從句的成分完整,所以排除who這個連接代詞。句子缺少為什么的意思,所以這里是why引導的表語從句,故選B。

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