B
不可能对他很了解
对“过去已发生事情”的口气较强的否定推测can't/couldn't have done.意为:根本不可能...
mustn't have done (不存在此用法)mustn have done.(肯定已.)
needn't have done...没必要已.
B
不可能对他很了解
对“过去已发生事情”的口气较强的否定推测can't/couldn't have done.意为:根本不可能...
mustn't have done (不存在此用法)mustn have done.(肯定已.)
needn't have done...没必要已.