◎ 题干
— What's the matter?
— I am having trouble ______ who has taken my book.

[     ]

A.finding
B.looking for
C.finding out
D.looking up
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“— What's the matter? — I am having trouble ______ who has taken my book. [ ]A.finding B.looking for C.finding out D.looking up …”主要考查了你对  【动词短语】  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。