Have you realized the difficulty we have ____ the problem?A．worked out B．to work_刷题宝

题干

Have you realized the difficulty we have ____ the problem?

A．worked out

B．to work out

C．work out

D．working out

上一题下一题 0.94难度单项选择更新时间:2010-08-17 02:47:54

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