_______ I came into the office,the teachers were having a me

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_______ I came into the office,the teachers were having a meeting
A When B While C Which D Since
理由也说下谢谢!

选B.
当我走进办公室,老师们正在开会.（2件事情是同时发生的）
while,当…的时候 (表示两事同时发生)
例句：They were grinning and watching while one man laughed and poured beer over the head of another.
当一个男人大笑着将啤酒倒在另一个男人头上时,他们正边看边咧着嘴笑.
I sat on the chair to unwrap the package while he stood behind me.
我坐在椅子上打开包裹,当时他就站在我身后.
以上,希望可以帮到你,

_______ I came into the office,the teachers were having a me When I went into the office,the teachers were busy ____ prep Our teachers are having a m___in the teachers' office. my teachers are having a metting in the office now 改错 Just now I saw a man entering into the teachers' office. Don't enter the teachers'office.The teachers are having a __ go into the teachers' office还是offices? We were talking ____,the teacher came into the classroom I a When I came into the room,I saw him _______ his homework.A、d when i came into the field , a snake bit me ____ the left ha when i get into the office,the teachers _ _ some He saw a man come into the outer office.为什么不用came into?