Swan made a promise to his father he would have himself home early.A. whenB. whyC. /D. th

问题补充：

Swan made a promise to his father he would have himself home early.

A. when

B. why

C. /

D. that

答案：

A. when

B. why

C. /

(答案→)D. that

解析： 考查同位语从句。that 解释前面的名词promise，句意：斯旺向他的父亲许下诺言，诺言就是他会自己回家很早。故选D。