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

【答案】B
【解析】句意:過(guò)去,大部分孩子們由于貧困的經(jīng)濟(jì)而不能上學(xué)。because因?yàn)椋蟾鷱木;because of因?yàn),后跟名詞。since既然,跟從句;for因?yàn),跟從句。poor economy是名詞短語(yǔ),所以答案是B。

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