问题补充:
He can’t help housework, for he is busy for the examination.
A. doing; preparing
B. to do; to prepare
C. doing; to prepare
D. to do; preparing
答案:
A. doing; preparing
B. to do; to prepare
C. doing; to prepare
(答案→)D. to do; preparing
解析:可联系答.案.网客服索取。