问题描述：
英语翻译
4._____ ten minutes earlier,they would have found a few empty seats on the bus.
A.If they arrived B.Had they arrived
C.If they have arrived D.Did they arrived
4._____ ten minutes earlier,they would have found a few empty seats on the bus.
A.If they arrived B.Had they arrived
C.If they have arrived D.Did they arrived
问题解答：
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