请帮忙讲解几道英语被动语态的习题
You___ more beautiful in the light blue shirt.
A.see B.watch C.look D.look at
-What do you think of the TV play?-Wonderful.It is worth___ a second time.
A.watching B.watched C.seen D.seeing
How dirty the tables are!They need___.
A.to clean B.clean C.cleaning D.cleaned
请给出答案并解释