◎ 题干
Few students can understand the sentence until it _____ twice or three times.
[     ]
A. explains
B. is explained
C. will be explained
D. has explained
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Few students can understand the sentence until it _____ twice or three times.[ ]A. explains B. is explainedC. will be explained D. has explained…”主要考查了你对  【被动语态】【一般现在时】  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。