Question

—Why was he late for school yesterday?
— He overslept. By the time he got to the bus stop, the bus ________ already ______.

A．has; left

B．had; left

C．was; leaving

D．have; left

Answer 1

B

解析試題分析：句意：昨天他為什么遲到了？——他睡過頭了。他到達(dá)公交車站時(shí)，公交車已經(jīng)開走了。結(jié)合語境可知下文描述的是一直持續(xù)到過去某時(shí)的動(dòng)作，故用過去完成時(shí)態(tài)，選B。
考點(diǎn)：考查動(dòng)詞的時(shí)態(tài)。