摘要： 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
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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
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