Uncle John is going to take a trip to America alone.

Uncle John is going to take a trip to America alone.
But he _____ he _____ take me along.
A.promises; will B.has promised; will C.promised; would
D.had promised; would

选C john将要一个人去美国,但是他曾经承诺过带我去.承诺“这一动作发生在过去,因此A(一般现在时）D(过去完成时) 排除 这里应该用过去将来时,John曾经说将来带我去美国 因此选过去将来时 而承诺的动作发生在过去 所以用一般过去时
过去将来式：would+动词原形构成过去将来时,常表示根据计划或安排即将发生的事
He said he would come to see me.他说他要来看我.