问题描述：
quite a lot of people came over to help the poor man____at once
A.not asking B.without being asked C.without asking D.not asked
为什么选B啊,being asked是什么时态?
A.not asking B.without being asked C.without asking D.not asked
为什么选B啊,being asked是什么时态?
问题解答：
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