[单选题]34Whichofthefollowingstatementsarethesame?()Ix-=x+4IIx=x+4-xIIIx=x-(x+4)

A
I and II are the same
B
I and III are the same
C
II and III are the same
D
I,   II, and III are the same
正确答案:B
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