题目

Tom kept quiet about the accident______ lose his job. A. so not as to      B. so as not to  C. so as to not  D. not so as to   答案：B 640÷80= 720÷90= 480÷80= 360÷60= 720÷80= 420÷70= 150÷30= 480÷60= 350÷70=