2. 外语
  3. I spent half an hour ______ this difficult math problem.

I spent half an hour ______ this difficult math problem.

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问题 I spent half an hour ______ this difficult math problem.
选项 A、having worked on
B、to work on
C、on work
D、working on
答案D
解析 本句测试“spend (some time，some money)in doing sth (on sth)”句型，因此选D。例如；He spent his life writing the book. (他花一生的时间写这本书。) He spends more time on sports than on studies. (他花在体育运动上的时间比花在学习上的时间多。)
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