A:was warned, would not take
B:had been ,warned, would not have take
C:would be warned, had not take
D:would have been warned, had not take
你认为下列各项不能作为海陆变迁证据的是( )
在平面直角坐标系中,点A(1,3)关于原点O对称的点A′的坐标为( )