单项选择题
Two tugs are helping the ship. One is pulling from forward, the other is （）.
A. pulling aft B. pushing fore C. pushing aft D. pulling fore
单项选择题 The ship is （）at the wharf slowly.
单项选择题 The ship is to （）to buoys.
单项选择题 The ship is going to （）the wharf.
