题目内容
【题目】Tomorrow we’ll have a school trip. But Sally _______ (has to/ had to) stay at home to look after her sick mother.
【答案】has to
【解析】
句意:明天我们将会有一个学校旅行,但是Sally必须待在家照顾他生病的妈妈。Sally是单三人称,动词应该用单三动词has to。故答案为has to。
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