问题
选择题
----Mike! What are you doing there?
----Listen, Mum! I hear somebody______upstairs.
A．going
B．goes
C．go
D．to go
答案
答案：A
搜题请搜索小程序“爱下问搜题”
----Mike! What are you doing there?
----Listen, Mum! I hear somebody______upstairs.
A．going
B．goes
C．go
D．to go
答案：A
--l个钙离子带两个单位正电荷