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Last Sunday he made a promise he was free he would take me to Qingdao. A. if B.

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Last Sunday he made a promise he was free he would take me to Qingdao. A. if B.

Last Sunday he made a promise ________ he was free he would take me to Qingdao.

A. if                 B. that                C. that if       D. whether

试题答案

C