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初中英语
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单选题
1. You never know how much difficulty we had ____________the problem. Luckily, we managed to solve it with Mr Zhang's help.
A .
working out
B .
work out
C .
worked out
D .
to work out
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初中英语牛津译林版九年级上册Unit 3 Teenage problem Task&Self-assessment基础练习