◎ 题干
The teacher, along with his students, _____ experiments in the laboratory when the explosion happened.

[     ]

A. was doing
B. were doing
C. have been doing
D. had done
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“Readandludge. 阅读,判断正“√”误“×”。 Mary'sdayAt7:00Putonmyredjeansandwhitejacket.At7:15Gotoschool. At9:00GotoEnglishclass. Atl0:00Readbooksintheplayground.…”主要考查了你对  【过去进行时】【主谓一致】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。