look,there [ ]deer[ ]with the trouists on the mountaina are a number of ,playing b are a number of ,playc is a number of ,playingd is a number of ,play

问题描述:

look,there [ ]deer[ ]with the trouists on the mountain
a are a number of ,playing
b are a number of ,play
c is a number of ,playing
d is a number of ,play

选A, deer是单复数同形,第二个空是现在分词表进行

选A,但deer为复数