【问】 I ____ you of his honesty.

A. assure B. insure C. ensure D. sure(大学生英语竞赛题)

答案为A (assure)。不知能否选C。

【答】 应记住，只有assure才可以用于assure sb. of，而ensure不能用于此种结构。

1. He assured us of his ability to work. (LDCE)

他向我们保证他有工作能力。

2. He assured me of his readiness to help. (ALD)

他向我保证他愿意帮忙。

ensure只能用于ensure sb. sth.，ensure sb. against sth.和ensure that从句结构。

1. This medicine will ensure you a good night's sleep. (LDCE)

这种药一定能使你晚上睡好觉。

2. Vaccinations ensure one against diseases. (MD)

注射疫苗能防止人患病。

3. We must ensure that the telegram arrives in time.(Nelson，500D)

我们必须保证电报能及时送到。

请做下面的英语试题：

The patient has been________ of the safety of the operation.

A. assured_______B. guaranteed

C. entrusted D. confirmed(攻读硕士学位研究生入学考试英语试题，92A)

(参见ensure/assure)