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I spent half an hour( )this difficult math problem.
I spent half an hour( )this difficult math problem.
admin
2016-03-11
90
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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成人本科学位英语
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