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

I spent half an hour( )this difficult math problem.

admin2016-03-11  50
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 习惯用法。spend some time(some money)in doing sth．(on sth．)，如：She spent the whole afternoon shopping．她一下午都在购物。
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