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

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

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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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成人本科学位英语

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