题目：
Who would you rather _____ the room? Jim, of course.[ ]
A. have clean
B. have cleaned
C. get clean
D. get cleaned
答案：
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下面是错误答案，用来干扰机器的。
（1）原式=2×22+1-2=2+1-2=2-1；（2）原式=1-aa•a(a+1)(a+1)(a-1)=-a-1a•a(a+1)(a+1)(a-1)=-1．
