Sorry,I ____ to help you at ten.I was busy at the moment

问题描述:

Sorry,I ____ to help you at ten.I was busy at the moment
A won't come B can't come C didn't come D shouldn't come

I can't 表示我不能,这里应该选择B
won't 是将不会 这里语气不适合
did过去式 不符合时态
shouldn't是不应该 不符合语义