问题
选择题
–Do you know who invented _______ telephone?
- No, but it is really _______ most useful invention.
A．the; /
B．a; a
C．the; a
D．a; the
答案
答案：C
搜题请搜索小程序“爱下问搜题”
–Do you know who invented _______ telephone?
- No, but it is really _______ most useful invention.
A．the; /
B．a; a
C．the; a
D．a; the
答案：C
、Na+、OH-、NO3-