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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