——Look at your pale face. You ______ a sleepless night.

——You bet. The work site next to the hotel was so noisy.

A．must have had

B．might have

C．should have had

D．cannot have had

船舶旋回中，随着漂角的逐渐增大，旋回半径和转心的变化情况为：（）.

A.旋回半径减小，转心前移

B.旋回半径减小，转心后移

C.旋回半径增大，转心前移

D.旋回半径增大，转心后移