—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】選A�？疾閯釉~短語辨析。ring off掛斷電話；ring up打電話；hang on不要掛斷；ring back回電話。由題意可知，應選A。

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