两道关于名词性从句的英语选择题,请说明为什么,

两道关于名词性从句的英语选择题,请说明为什么,
1.Loulan city is not at all ______ a traveler who has never seen the desert before can except.
A.what B.that C.which D.where
2.We should buy our daughter a computer in _____ it can help to improve her English.
A.which B.that C.what D.whom
第一题中except应改为expect，打错了，不好意思。