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

游客2023-10-04  24

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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