Astheteacher＿＿theproblem,someofth

发布时间：2020-07-09 13:05:16

As the teacher ＿＿the problem, some of the students ＿＿ to sleep.













A.explained ; was going












B.was explaining ; went











C.was explaining ; was going











D.explained ; went

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B解析此题虽系单句，但上下文决定时态的应用。
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