题目

Mary nearly missed the flight doing too much shopping.A.in need of B.on top ofC.in front of D.as a result of 答案：【答案】D【解析】考查介词短语辨析。句意：由于购物太多，Mary差点错过了航班。A in need of需要；B on top of在…上；C in front of在…前面；D as a result of由于。根据句意可知购物太多是差点错过航班的原因，故选D。

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