问题补充：
I want to ring him＿＿＿to know the reason why he rang＿＿＿while I was speaking yesterday.
A. up； off
B. back； up
C. up； down
D. on； off
答案：
(答案→)A. up； off
B. back； up
C. up； down
D. on； off
解析：ring sb. up意为“给某人打电话”；ring off的意思是“挂断电话”。
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