2. 外语
  3. If (keep) ______ in humid condition, the milk can’t remain fresh for three days.

If (keep) ______ in humid condition, the milk can’t remain fresh for three days.

admin2013-12-03  35
问题 If (keep) ______ in humid condition, the milk can’t remain fresh for three days.
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答案kept
解析 过去分词表示被动意义。
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