问题
单项选择题
If a = 1 and 
, which of the following is NOT a possible value of b ？（）
A.-2
B.-1
C.0
D.1
E.2
答案
参考答案：D
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If a = 1 and , which of the following is NOT a possible value of b ？（）
A.-2
B.-1
C.0
D.1
E.2
参考答案：D