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填空题
All visitors to the lab (expect) ____ to take off their shoes before they enter.
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解析：
本题考查动词的被动语态。句意：所有参观实验室的人员在进入之前都要脱鞋。本句中的谓语动词和主语之间是被动关系，要使用被动语态。主语为名词复数形式，故填入are expected。
本题考查动词的被动语态。句意：所有参观实验室的人员在进入之前都要脱鞋。本句中的谓语动词和主语之间是被动关系，要使用被动语态。主语为名词复数形式，故填入are expected。
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