I want to ring him _______ to know the r
题型:选择题
问题:
I want to ring him _______ to know the reason why he rang _______ while I was speaking yesterday. [ ]
A. back; up
B. up; off
C. up; down
D. on; off
I want to ring him _______ to know the reason why he rang _______ while I was speaking yesterday. [ ]
A. back; up
B. up; off
C. up; down
D. on; off