题目

We all suggest that she _____ at the weekend, because her pale face suggests that she _____ in bad condition.    A. does not work; is      B. cannot work; was      C. not worked; was         D. not work; is 答案：D 解析: 略若是方程3x﹣3y=m和5x+y=n的公共解，求m2﹣3n的值．