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—Sorry, I have to_________now. It’s time for class.

—OK,I’ll call you back later.

A. ring off         B. ring up

C. hang on         D. ring back

【解析】选A。考查动词短语辨析。ring off挂断电话;ring up打电话;hang on不要挂断;ring back回电话。由题意可知,应选A。

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