we can't wait to be ( )the singing contest A.at B.on C.in 单选及原因

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we can't wait to be ( )the singing contest A.at B.on C.in 单选及原因
we can't wait to be ( )the singing contest A.at B.on C.in 单选及原因

we can't wait to be ( )the singing contest A.at B.on C.in 单选及原因
选B,题目的意思是在歌唱比赛中,与in搭配.

切合语境搭配的话是C in. 表参加的意思、