do you know when the meeting begin?BLANK he comes backA if B when C until

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doyouknowwhenthemeetingbegin?BLANKhecomesbackAifBwhenCuntildoyouknowwhenthemeetingbegin?BLANKhecomes

do you know when the meeting begin?BLANK he comes backA if B when C until
do you know when the meeting begin?BLANK he comes back
A if B when C until

do you know when the meeting begin?BLANK he comes backA if B when C until
选B.
你知道会议什么时候开始吗?当他回来的时候.
A是如果,如果他回来,不符合语境.
C是直到他回来,那就要用到not和它搭配.

这也属于问题

B

直到他回来,那就要用到not和它搭配。