2. 外语
  3. All visitors to the lab (expect) ______to take off their shoes before they enter.

All visitors to the lab (expect) ______to take off their shoes before they enter.

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问题 All visitors to the lab (expect) ______to take off their shoes before they enter.
选项
答案are expected
解析 本题考查对被动语态用法的掌握。根据句意，这里应该用被动语态，即所有来访者进实验室前被要求脱鞋子。
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