题干
— Do you have any difficulty in _______ English.
— Yes, but I try to make myself _________.
A：to speak; understood
B：speaking; understand
C：to speak; to understand
D：speaking; understood
答案(点此获取答案解析）
D
四块，现有4种不同的花供选种，要求在每块里种1种花，且相邻的2块种不同的花，则不同的种法总数为（ ）
