碰到了几道题，我怎么也想不明白它的答案为何如此
，所以发上来请大家指导。
1.My mother still remember the day ______ I joined the army.
A.on that B.in which C.when D.that
2.He regreted the days ______ he had spent in the forest.
A.when B.on which C.in which D.that
3.Is this the office ______ your father once worked before he die?
A.the one B.which C.where D./
4.Is this office _______ you visited yesterday?
A.the one B.which C.that D./
5.He has done all he ______ with her.
A.can catch B.can to catch up C.is able to catch up D.could catch up
6.Anyone _______ this opinion may speak out.
A.that againsts B.that against C.who is against D.who are against
7.The biggest laboratory ______ we have ever visited is this.
A.what B.which C./ D.where
8.This is the place ______ you visited last year.
A.where B.that C.what D.the one
9.This place is ______ you visited last year.
A.where B.that C.which D.the one
10.Is this park ______ we played games?
A.where B.the place where C.which D.in which
11.This bool is quite difference from _______ I read last month.
A.the one B,which C.that D.whose
12.It is the first time ______ late this term.
A.that B.on which C.in that D.in which
13.Is it in that factory ______ 'Jie Fang' trucks are produced?
A.that B.where C.in which D./
14.July 1,1927 is the year _______ the Coummunist Party of China was born.
A,on which B.in which C.for which D.at which
15.Such students ______ study hard will pass the examination.
A.who B.that C.as D.which
