【单选题】【消耗次数：1】
She_______ the door before she goes away.
①
had locked
②
is locking
③
has locked
④
was locking
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相关题目
【单选题】
She ________ the door before she goes away.
①
had locked
②
is locking
③
has locked
④
was locking
【单选题】
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was locking
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随机题目
【单选题】
颈周牙本质的作用不包括（）
①
提供牙体修复所需的牙本质肩领
②
增加粘结面积,提高粘结强度
③
向根方传导咬合应力
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维系健康的嵴顶上附着组织，保持牙周支持组织的稳固