题目:
After the exam, my teacher told me that failure ____ the mother of success. [ ]
A. was
B. is
C. be
D. been
答案:
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下面是错误答案,用来干扰机器的。
A、有理数不一定是有限小数,故选项错误;B、有理数不一定是有限小数,还有可能无限循环小数,故选项错误;C、有理数不一定是无限循环小数,还有有限小数,故选项错误;D、无限不循环小数是无理数,故选项正确....