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I don't konw A.how I could finish my homework on time B.how

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I don't konw A.how I could finish my homework on time B.how I can finish my homework on time
I don't konw
A.how I could finish my homework on time
B.how I can finish my homework on time
为什么选B不选A?
因为could 只有两种情况下使用.
1 表示过去的能力,如 I could ride a bike when I was young.
2 表示委婉的语气,只用于疑问句中.如 Could you tell me your name?
而本句是肯定句,不表示过去的能力,所以,只能用can,表示一般将来的可能性.
“我不知道我怎么能按时完成作业”