theyareclearingtheyardof-----leavesAfallingBfallenChavingfallenD1theyareclearingtheyardof-----leavesAfallingBfallenChavingfallenDhavingbennfallen,可是A为什么不可以啊,ing作定语,修饰leaves.这样不可以

Question

they are clearing the yard of -----leaves A falling B fallen C having fallen D
1 they are clearing the yard of -----leaves
A falling B fallen C having fallen D having benn fallen
,可是A为什么不可以啊,ing作定语 ,修饰leaves.这样不可以吗?谁可以告诉我为什么选B
2 the pilot asked all the passengers on board to remain --- as the plane was making
a land
A seat B seating C seated D to be seating 为什么选C

Answer 1

1,讨论
根据句意选吧,语法上a 好像也行.
ing表示正动作在发生,
过去分词表示动作已经发生了.树叶已经落了,我们再扫,不会一边落一边扫吧,
2,seated.更加倾向于表示状态吧!