选择 A:Why was he late for school yesterday? B:He overslept . By the time he got to the bus stop,the bus ___already ___. A.was ;leaving B.has ; left C.would ; leave D.had ;left 解答：D 解析：公共汽车在到车站之前就来了，所以用过去完成时。
选择 We () here today . A are all B all are C is all D all is 解答：A 解析：副词放在be动词之后。
