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Her grandma is here ( ) three days Afor Bin Cat Dbefore

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Her grandma is here ( ) three days Afor Bin Cat Dbefore
Her grandma is here( ) three days
for 还是 in 还是 at 还是 before
Her grandma is here ( ) three days Afor Bin Cat Dbefore
Her grandma is here ( ) three days
Afor Bin Cat Dbefore
选项是A
再问: 为什么呢..
再答: Her grandma is here ( for) three days 句意是:她的爷爷在这里【滞留/停留/呆】三天。介词in表【将来】,介词at表【时间点】,不能持续【三天】。介词before用于【过去时】