How the fire in the dancing hall started _________ a mystery.A．to remainB．remain_刷题宝

题干

How the fire in the dancing hall started _________ a mystery.

A．to remain	B．remains
C．is remaining	D．is remained

上一题下一题 0.64难度单项选择更新时间:2013-05-11 11:56:14

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