问题补充:
He explained the question again to make it easier .
A. to understand
B. understanding
C. understood
D. understand
答案:
(答案→)A. to understand
B. understanding
C. understood
D. understand
解析:考查句型:make it+adj+to do…,使得做…如何…,it是形式宾语,不定式是真正的宾语,句意:他再次解释这个问题使它变得更容易。选A。