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
网友回答
A. 不填；不填
(答案→)B. 不填; a
C. the ; a
D. 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。