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Mother wanted to be a good provider, a role she ______ since her marriage to Father.
A.shouldersB.shouldered
C.is shoulderingD.has been shouldering
D

试题分析:考查时态。本句的关键是后面的since her marriage to Father,该介词表示“自从…”要和现在完成时或者现在完成进行时连用。故D正确。
点评:时态题的考查关键是抓住句子的上下文含义和句中的时间状语。要根据时间状语来选择合适的时态,在平时的学习中要注意积累有关时态的用法和各种时态的特殊之处。如since, so far等经常与现在完成时连用。在条件状语从句中用一般现在时代替将来时等等。
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