◎ 题干
— How unhappy your roommate looks!
— Yes, but he's not willing to tell me what it is ____ is troubling him.

[     ]

A. what
B. which
C. as
D. that
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“— How unhappy your roommate looks! — Yes, but he's not willing to tell me what it is ____ is troubling him. [ ]A. what B. which C. as D. that …”主要考查了你对  【强调句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。