用所给词的适当形式填空:You shoud thing over the question carefully before ( )(answer)it急,请尽快帮助,要解析

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用所给词的适当形式填空:You shoud thing over the question carefully before ( )(answer)it急,请尽快帮助,要解析

用所给词的适当形式填空:You shoud thing over the question carefully before ( )(answer)it急,请尽快帮助,要解析
用所给词的适当形式填空:You shoud thing over the question carefully before ( )(answer)it
急,请尽快帮助,要解析

用所给词的适当形式填空:You shoud thing over the question carefully before ( )(answer)it急,请尽快帮助,要解析
answering
此处answering是主语,动词做主语要变成动名词,所以是answering