“why were you so late for work today?” "_____to the office was very slow this morning because of the traffic" A.Driving B.To drive C. I drove D.That I drove 选择哪个，请高手顺便帮忙解释一下哈
选A. 动名词、不定式都可以作主语，但是不定式较长时，一般用it做形式主语，而把不定式放后面，如此句要用不定式表达就是： It was very slow to drive to the office this morning because of the traffic。因此，应用动名词作主语，选A。