Question

【题目】By the time I got up, my mother _______ .

A. left B. had left C. has left D. is leaving

Answer 1

【答案】B

【解析】by the time意为“在……之前”，根据语境可知“离开”这一动作发生在“起床”之前，根据got up为过去式，判断使用过去完成时表达。