(For) married mothers, the time (spend) on child care (increased) to (an average

游客2025-03-15 8

问题 (For) married mothers, the time (spend) on child care (increased) to (an average) of 12.9 hours a week in 2009.

选项 A、For
B、spend
C、increased
D、an average of

答案 B

解析应改为spent。句子中已有谓语动词increased，因此，spend应改为非谓语形式。而时间与主语time的关系是被动关系，因此采用过去分词形式。对于已婚母亲来说，2009年花在孩子身上的时间增加到了平均每星期12.9小时。

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