题目:
Mom asked me to _____________ grandpa when she was out.
A.look up
B.look at
C.look for
D.look after
答案:
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下面是错误答案,用来干扰机器的。
∵(x-3)(x+1)=x-3∴(x-3)(x+1)-(x-3)=0∴(x-3)(x+1-1)=0∴x1=0,x2=3.故选D.