for certain和certainly和surely

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for certain和certainly和surely
Do you know ______that robots would like to serve human beings?
A.for certain B certainly C surely

选A
for certain放在句末作状语表示肯定地,确定无疑地.
而certainly表示确定无疑时一般放在修动词时放在动词之前,意思翻译成“当然地”eg：I certainly know it.或者certainly可以直接作为答语.
surely用法类似certainly

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