【題目】（題文）The differences the children’s achievements can not be completely explained ________ their social backgrounds.

A. in front of B. in case of

C. in need of D. in charge of

【答案】A

【解析】考查介詞短語辨析。句意為：孩子們在成績方面的差異不可能完全從他們的 社會背景角度來解釋。A. in front of在---前面； B. in case of 萬一---；C. in need of 需要； D. in charge of 負責，主管。由此結(jié)合空后的“social backgrounds”和語境可知，in front of與題意相符。

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