He was proud of being chosen to participate in the game and he( )us that he would try as hardas poss

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考试：

科目：（在线考试）

问题：

He was proud of being chosen to participate in the game and he( )us that he would try as hardas possible.
A：insured
B：guaraeed
C：assumed
D：assured

答案：

解析：

assure sb.of ...或assure sb.that...意思是“向某人保证……“。译：他为自己被选去参加比赛而骄傲，他向我们保证他会尽最大的努力。insure投保：insure sb.'s property against fire给某人财产保火险；guaraee (尤对质量）保证：guaraee the quality of products 保证产品质量；assume 假定。