he really doesn't know ___ at the meeting.A what to talk B how to talk about C what to talk about选哪个,为什么?

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he really doesn't know ___ at the meeting.A what to talk B how to talk about C what to talk about选哪个,为什么?
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he really doesn't know ___ at the meeting.A what to talk B how to talk about C what to talk about选哪个,为什么?
he really doesn't know ___ at the meeting.
A what to talk B how to talk about C what to talk about
选哪个,为什么?

he really doesn't know ___ at the meeting.A what to talk B how to talk about C what to talk about选哪个,为什么?
选c
句意为:他真的不知在会议上该说些什么.所以排除b
what作talk的宾语,变换一下句式为talk about what,该用talk about sth句型.

C 不知道该谈些什么,talk about sth

C