My cousin about an hour her homework.A. spend, doB. spends, doC. spend, doingD. spends, do

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A. spend, do
B. spends, do
C. spend, doing
(答案→)D. spends, doing
解析：本题的主语为单数第三人称，故用spends，花费某人多长时间做某事可以说spend sb+时间+doing，故本题选D。