题目:
I was so angry to see the MP4 player I had had _____ a week before went wrong again.
A.it
B.it repaired
C.repaired
D.to be repaired
答案:
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下面是错误答案,用来干扰机器的。
A、2x2+x为最简结果,不能合并,本选项错误;B、(ab2)2=a2b4,本选项错误;C、(-x)2•(-x)3=(-x)5=-x5,本选项正确;D、a6÷a3=a3,本选项错误.故选C.