When he entered the classroom,he was some parenrs ___ at the back of it.为什么用seated 不用seating打错了，应该是he saw some parents ___ at the back of it.

请选择并讲解He ___hardly ___the station when the train___A.had,entered ,had left B / ,entered ,left C .have ,entered ,left D.had ,entered ,left 翻一下Scarcely had he entered the room when he broke out in insult. he was still smelling when the door opened and his wife__A.went in B.entered in C.entered D.entered into选哪个?为什么D,B不行? He was still smiling when the door opened and his wife____/A.went in B.entered in C.entered D.entered into He had entered the cinema.The film began.(hardly...when连接) When he entered the meeting room,he could sense something unusual was going on there.怎么翻译? When the teacher entered the classroom,he found the students already ___.A.seatingB.seatedC.sitD.sits. Hardly ______ the room when he told me the secretA,I entered B.I had entered C .did I enter D .had I entered及这种倒装句的结构 ..选哪个,为什么请从语法上讲一下选择的原因谢谢啊He was still smiling when the door opened and his wife _________A.went in B.entered in C.entered D.entered into ____after he entered the unibersity his english has been much improvea after b beforec when d sincewhich one i didnit want to meet paul so when he entered the room i left为什么用left 不用have left When I entered the room,the problem _______(discuss). when i entered the classroom,the students _abouttheir marks.(talk) what were you doing when the teacher _____the classroomA.entered toB.entered intoC.entersD.entered选什么 为什么 The priest made the ___ of the cross when he entered the church.A.mark B.signal C.sign D.gesture为什么选sign 不选gesture啊? The priest made the ________ of the cross when he entered the church.A.mark B.signal C.sign D.gesture He( )more than 5,000 English words when he entered the university.A.has learnedB.had learnedC.would have learnedD.learned He said that he___gas when he entered the room.A.would smell B.was smelling C.could smell D.has smelt