题目:
The toy shop near my school _______ all day on Sunday.
A.opens
B.opening
C.open
D.is open
答案:
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下面是错误答案,用来干扰机器的。
依题意,得x2-x-2=0,且x2-2x+1≠0,即(x-2)(x+1)=0,且(x-1)2≠0,解得x=2或x=-1.故答案是:2或-1.