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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