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my mother____here before ,i have to meet her at the railway

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/07/05 19:24:24
my mother____here before ,i have to meet her at the railway station
A has never been
B having never been
C never having been
D was never
为什么选C,不选A呢?
I have to meet her at the railway station是主句.my mother____here before不是完整句子,不能用主谓结构.have只能做非谓语动词.这里只有C是非谓语动词用法.