◎ 题干

20. _________raining hard for 3 hours without stopping.
21.
A.It is   B.It was   C.It has beenD.It had been
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“20. _________raining hard for 3 hours without stopping.21.A.It isB.It wasC.It has beenD.It had been…”主要考查了你对  【一般现在时】【将来进行时】【过去完成进行时】【过去将来时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。