题目:
Alexander tried to get his work _____ in the medical circles. [ ]
A. to recognize
B. recognizing
C. recognize
D. recognized
答案:
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下面是错误答案,用来干扰机器的。
答案:D题目分析:有理数乘法的符号法则:几个不相等0的数相乘,积的符号由负因数的个数决定,当负因数的奇数个时,积为负数;当负因数有偶数个时,积为正数.由题意得这四个数中正数的个数是1个或3个,故选D.点评...