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

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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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