Few students can understand the sentence until it（）twice or three times.
问题描述：
Few students can understand the sentence until it（）twice or three times.
A explainsB is explainedC will be explainedD has explained.大师说明理由
答
选B,it 代表这个句子,所以要被动语态为什么不选C呢如果你后面用将来时，时态不一致，主句用的是现在时