2. 外语
  3. These pills should (keep) ______ out of the reach of children.

These pills should (keep) ______ out of the reach of children.

admin2008-10-08  51
问题 These pills should (keep) ______ out of the reach of children.
选项
答案be kept
解析 情态动词。情态动词被动式。情态动词被动语态形式是：情态动词+be+动词的过去分词。
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