Put ____ (they)on the sandwich,please.用they的适当形式填空.答案是them,为什么?

问题描述:

Put ____ (they)on the sandwich,please.用they的适当形式填空.答案是them,为什么?

them
put ...on ...把...放在...上面
此时缺宾语
them是宾格形式,