Entering the yard, I found it with lots of leaves.A. covering; fallingB. covered; fallen

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A. covering; falling
(答案→)B. covered; fallen
C. covered; falling
D. covering; fallen
解析：句意：已进入院子我就发现院子里盖满了落下来的叶子。Entering the yard是非谓语动词短语作状语；it这里指的是the yard；这里是find+ sth+done, it与cover之间是被动关系；第二空是falling leaves正在落的叶子，这里显然不符合语境；fallen leaves表示已经落下来的叶子。根据句意故选B。