A.worrying about B.worried about C.to worry about D.to being worried about
单项选择题If it had not been for the snow, we () the mountain yesterday.
A.can have climbed B.could climb C.can climb D.could have climbed
单项选择题Something was wrong with the engine of the plane. The pilot had to make().
A.a forced land B.a forced landing C.forced land D.forced landing
