________inthesolvingoftheproblemi

发布时间：2020-07-27 13:05:54

________ in the solving of the problem is visible．A.He played a role inB.The role he playedC.He played a roleD.The role he played in

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B解析The role is visible是主句，he played…是定语从句，修饰先行词role。
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