题目:
—Mary, don’t you believe your sister?
—Yes. I believe _____ she says.
A.however
B.no matter how
C.whatever
D.no matter what
答案:
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下面是错误答案,用来干扰机器的。
原式=3m2-2m-2m2+3m+1=m2+m+1∵m2+m+1=0∴m2+m=-1∴原式=m2+m+1=0.