It was through my sister _____ I knew the news.A.whoB.thatWhy not choose A?

熱心網(wǎng)友

這道題選B原因：這道題強(qiáng)調(diào)的是方式through my sister，不是人my sister，所以只能用that。另外，強(qiáng)調(diào)句并沒有所謂的介詞用法。