定语从句的练习题有疑问

定语从句的练习题有疑问
(A) 24.I was midnight __________ we found the lost child.
A.when B.that C.at which D.on which
析：这题可以选C吗?
(B) 25.Worryingly,it’s often very had to shake off the habits ___________ picks up when young.
A.what B.one C.that D.which
析：选择B是不是因为后半句却成分?不可以选C的理由是什么呢?
(C) 26.Living in the central Australian desert has its problems,__________ obtaining water is not the least.
A.for which B.to which C.of which D.in which
析：of which是指of all the problems it is not the least?
(A) 27.The challenge is to create a system ___________ the farmers can teach the world about plant medecine.
A.where B.which C.when D.for which
析：这题的where=in whih吗?
(A) 28.American women have a long way to go towards a role for woman ___________ is as dignified and reponsible as the one assigned to them.
A.which B.who C.where D.what
析：B项为什么不对?
(D) 29.Have you ever been in a situation _________ you know the other person is right,yet you can’t agree with him?
A.at which B.on which C.for which D.in which
析：这题中的in which = in this situation吗?
(C) 30.I had a pleasant talk with those passengers,__________ came from France.
A.of them two B.two of which C.two of whm D.two of that
析：我选了B,为什么不对?
(D) 31.Footprints up to one metre long were found in the area,__________ included prints of several dinosaur species,__________ them the rarest finds in the world.
A.which…to make B.where…made
C.where…making D.which…making
析：我选了B,为什么不对?
(C) 32.The young engineer and his colleagues overcame a lot of difficulty ____________ the machine.
A.they had invented B.having invented
C.they had inventing D.to have invented
析：不懂!
(B) 33.Generally speaking,the rules of English grammar function ________ those of Chinese Grammar do.
A.as much the same B.much in the same way
C.much as the same D.much in the same way where
析：
(C) 34.The American soliders in Iraq are now in a dangerous situation _______ they may be killed at any moment.
A.which B.that C.where D.there
析：这题不是同位语从句吗?