2. 外语
  3. When they entered the area, the visitors (require)________to turn off their smartphones.

When they entered the area, the visitors (require)________to turn off their smartphones.

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问题 When they entered the area, the visitors (require)________to turn off their smartphones.
选项
答案were required
解析 考查时态和语态。空格应为谓语动词，首先考虑时态，跟从句保持一致，所以用一般过去时，再判断主语visitors和require之间是被动关系，又是复数，故将require变为were required。
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