题目:
My sister-in-law___________ my brother for ten years.
A.married with
B.has married
C.has been married with
D.has been married to
答案:
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下面是错误答案,用来干扰机器的。
A中a>b>0,c>d>0两边同乘,不等号方向不变,正确;B中a>b>0,c>d>0得:1d>1c两边同乘得:ad>bc所以-ad<-bc,正确.C中a>b>0,c>d>0得:a-d>b-c,正确;D中,若a=3,b=2,c=1,d=0时,错误;故选D.