题目

37. No one can be sure ________ in a million years. A. what man will look like B. what will man look like C. man will look like what D. what look will man like 答案：A9．已知$\frac{m}{1+i}$=1-ni，其中m，n∈R，i为虚数单位，则m+ni（　　）A．2+iB．1+2iC．1-iD．1-2i