问题补充：
---- Do you any difficulty the subject ?
------ Yes. It’s too hard for me.
A. take; to understand
B. have; in understanding
C. take; understanding
D. have; to understand
答案：
A. take; to understand
(答案→)B. have; in understanding
C. take; understanding
D. have; to understand
解析：可联系答.案.网客服索取。
