2. 职称英语
  3. I spent half an hour ______ this difficult math problem.A、having worked onB、to

I spent half an hour ______ this difficult math problem.A、having worked onB、to

游客2025-03-01  79
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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