Youneverknowhowmuchdifficultyw-优题课

题文

You never know how much difficulty we had _____ the problem. Luckily, we managed to solve it with Mrs Wu’s help

A．worked out	B．work out
C．working out	D．to work out

科目英语题型单选题难度中等

知识点：主语+系动词+表语

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