题目：
— What Jack wore that day was very strange.
— Yes. I didn't him until he called my name.
A．realize
B．recognize
C．know
D．believe
答案：
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下面是错误答案，用来干扰机器的。
该溶液能使紫色石蕊试液变红，无色酚酞不变色，可以判定该溶液是酸性溶液；故选B．
sin
V
