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问题: 一道单选择题

she ___ ill because i saw play basketball just now.

A can't
B couldn't

二者的区别 你选择什么 为什么 谢谢。

解答:

首先,这句话有严重的错误,前半句却谓语,后半句缺宾语,感观动词后用的非谓语动词形式也不合适,正确的说法应该是
She can't be ill because I saw her playing basketball just now.
这两个词都表否定的推测,这时没有时态的区别,只是couldn't 比较委婉.从这句话的语气看,没有委婉的必要,所以选can't 更合适