Last night’s TV news said that by then exact evidence for the missing plane MH370      .

A．had not been found

B．had not found

C．has not been found

D．has not found

推土机在建筑物附近工作时，与建筑物的墙、柱、台阶等的距离不得小于（）。

A.0.5m

B.1m

C.1.5m

D.2m