英语问题1.翻译：Didn't you see the "No Stamping" sign on the grassl

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英语问题
1.翻译：
Didn't you see the "No Stamping" sign on the grassland.
2.Yesterday evening he was at home,so he ___________ having class at school.
A.can't have been B.couldn't have been
Which is right and why? Both OK? Translate.Thanks.

1、你没有看到草地上的“禁止践踏”的标语吗?
2、A
表示推测时,can比could可能性大,这里的推测是比较肯定的,所以用can比较好.
昨天晚上他在家里,所以他不可能在学校上课.

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