化简a+b+(a-b)的最后结果是 [ ]
A.2a+2b
B.2b
C.2a
D.0
答案:C
Mr. Smith wanted to buy the house and he told me that ____the house cost,it would be worth it. [ ]
A. however
B. how much
C. whatever
D. what
为克服一考定终身的弊端,推进素质教育实施和创新人才培养,《教育规划纲要》提出,要逐步形成()的考试招生制度。