问题
选择题
---Has your father come back from Africa?
--- Yes, but he ______ here for only three days before his company 
sent him to Japan.
A．was
B．has been
C．will be
D．would be
答案
答案：A
略
搜题请搜索小程序“爱下问搜题”
---Has your father come back from Africa?
--- Yes, but he ______ here for only three days before his company sent him to Japan.
A．was
B．has been
C．will be
D．would be
答案：A
略
2NaOH + H2↑+ Cl2