几道英语选择题(要原因)1.This is the bag ____ my mother bought yesterda

几道英语选择题(要原因)
1.This is the bag ____ my mother bought yesterday.
A.that B.who C.whom D.this
2.The man ___lives next to us is my English taecher.
A.whom B.which C.who D./
3.The girl ____ you saw in the street is Mary
A.that B.whose C.which D.as
4.Is this the factory ____ a lot of students visited yesterday?
A.the one B.which C.who D.whom