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

游客2024-06-22  10

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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