When Mary saw piles of plastic in the bin, strong sense of responsibility made her stick

When Mary saw piles of plastic in the bin, strong sense of responsibility made her stick to her recycling work．
A. 不填；不填
B. 不填; a
C. the ; a
D. the; the

A. 不填；不填(答案→)B. 不填; aC. the ; aD. the; the解析：考查冠词：第一空不填，piles of成堆的，第二空填a，a strong sense of responsibility一种强烈的责任感，句意：当玛丽看见垃圾箱里成堆的塑料，一种强烈的责任感让她坚持要回收工作。选B。

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