You must have been driving at seventy miles an/per hour.你刚才一定是以每小_英语解答

You must have been driving at seventy miles an/per hour.
你刚才一定是以每小时70英里的速度开车.
1.为什么要用ing

人气：400 ℃　时间：2020-03-28 07:59:05

解答

must have been doing
是must 表示对【过去正在发生的】事情的推测.
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