问题
选择题
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
答案
答案：B
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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
答案：B