I have spent a lot of time（）working on this problem. -题库考试答案搜索网

I have spent a lot of time（）working on this problem.

单选题

2021-12-31 23:03

A、at
B、–（不填）
C、on
D、with

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正确答案

B

试题解析

标签：专升本英语

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