问题
单项选择题
How many subsets does A have ( ) let A={1,2,3,4,5,6,7)
A．128
B．64
C．32
D．16
答案
参考答案：A
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How many subsets does A have ( ) let A={1,2,3,4,5,6,7)
A．128
B．64
C．32
D．16
参考答案：A