正方形边长为右厘米,那么它的周长是______厘米.
3×图=大2(厘米);
答:正方形边长是3厘米,则其周长为大2厘米.
故答案为:大2.
It ( ) around six o'clock when I drove back yesterday because it was already dark.
A.must have been
B.must be
C.was to be
D.had to be
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