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

问题补充：

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

A. if

B. that

C. that if

D. whether

答案：

A. if

B. that

(答案→)C. that if

D. whether

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