I______him that I would help him if he had any difficulty in carrying out the task.

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问题 I______him that I would help him if he had any difficulty in carrying out the task.

选项 A、ensured
B、assured
C、guaranteed
D、vowed

答案B

解析本题考查近义词辨析。ensure常用从句充当宾语，assure sb．that的意思是“跟某人保证……”，guarantee“保证”，常用做保证产品的质量，vow“宣誓”。因此本题正确答案为B。

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