He made a promise he would help me.A. thatB. whichC. whetherD. why

问题补充：

He made a promise he would help me.

A. that

B. which

C. whether

D. why

答案：

(答案→)A. that

B. which

C. whether

D. why

解析：考查同位语从句。That引导同位语从句that he would help me解释promise的内容。