–Tom seems not so enthusiastic as he was two years ago.

--Yes. He’s reached a point in his career_________ he has to decide what to do next.

A．that

B．when

C．where

D．which

在公路的每个路段都有交通管理部门设置的限速标志，如图所示是告诫驾驶员在这一路段驾驶车辆时（）

A.必须以这一规定速度匀速行驶

B.瞬时速度大小不得超过这一规定数值

C.平均速度大小不得超过这一规定数值

D.汽车上的速度计指示值，可以超过这一规定值