Tomorrow we’ll have a school trip. But Sally _______ (has to/ had to) stay at home to look after her sick mother.
正确答案及解析
正确答案
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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