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

【答案】B
【解析】句意:過去,大部分孩子們由于貧困的經(jīng)濟而不能上學。because因為,后跟從句;because of因為,后跟名詞。since既然,跟從句;for因為,跟從句。poor economy是名詞短語,所以答案是B。

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