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【题目】In the past, most children couldn't go to school poor economy(经济).
A.because
B.because of
C.since
D.for

【答案】B
【解析】句意:过去,大部分孩子们由于贫困的经济而不能上学。because因为,后跟从句;because of因为,后跟名词。since既然,跟从句;for因为,跟从句。poor economy是名词短语,所以答案是B。

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