【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(yǔ)從句。句意：他們?cè)谶@個(gè)領(lǐng)域有領(lǐng)先的專(zhuān)家，這就是為什么他們成功地解決了這個(gè)問(wèn)題。分析句子結(jié)構(gòu)，be動(dòng)詞后面的表語(yǔ)從句的成分完整，所以排除who這個(gè)連接代詞。句子缺少“為什么”的意思，所以這里是why引導(dǎo)的表語(yǔ)從句，故選B。

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