1250减去□正好是150的3倍。□内应填请选择ABC2_,L8g5|0V+m+V8h0o.M8m*y(D,E0Y0{1Y+W5B9q.n
A.800*y(D,E0Y0{1Y+W5B9q.n
B.450*y(D,E0Y0{1Y+W5B9q.n
C.50*y(D,E0Y0{1Y+W5B9q.n