Question

i found the very watch of mine___i had left__ a where it b t

Answer 1

的确是a.where ...it 正确.如果是b.that ...it 的话,that这个关系代词就指代the very watch,在从句中作主语或宾语.但是从句的主语已经有,即 I,宾语也已经出现,即 it,可见从句既不缺主语,也不缺宾语,that就是多余的....