I'm sure that they were listening to the radio. they ____ ____bee_英语解答

I'm sure that they were listening to the radio. they ____ ____been listening to the radio.同义句

人气：289 ℃　时间：2019-10-14 03:05:00

解答

更正楼上答案如下：
= They (must have) been listening to the raido.
must have been doing sth （当时）一定在做某事
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