关于定语从句的选择题.②

关于定语从句的选择题.②
1 This is the child _____ for two years.
A after whom she has looked
B that she has looked after him
C whom she has looked after
D which she has looked after
2 There are 20 students ,most of ____ come from foreign countries
A who B that C which D whom
3 The first place ____ I visited in Beijing was the Summer Palace.
A taht B which C it D where
4 I'm looking for a book ____ I can learn something about Mars.
A which B taht C from taht D from which