it's dangerous ____with the wild animals .A. for us to play B. of us playing C. for us playing D. of us to play 写解释

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it's dangerous ____with the wild animals .A. for us to play B. of us playing C. for us playing D. of us to play 写解释

it's dangerous ____with the wild animals .A. for us to play B. of us playing C. for us playing D. of us to play 写解释
it's dangerous ____with the wild animals .
A. for us to play B. of us playing C. for us playing D. of us to play 写解释

it's dangerous ____with the wild animals .A. for us to play B. of us playing C. for us playing D. of us to play 写解释
A,不定式引导的从句做主语