His grandfather wrote a lot of instructive stories for children,_____this is one example求大神指教

题目

His grandfather wrote a lot of instructive stories for children,_____this is one example求大神指教
1.His grandfather wrote a lot of instructive stories for children,_____this is one example.
A in which B of which C by which D of which
2.Dd you know the gentleman _____ our president is shaking hands ______.A with whom ,不填B.whom,byC.that,不填D.for whom,with
3.He offerd us a lot of money ______we couldnt have introduced the advanced machines from abroad.
A.without which B.with that C.with which D.without that
还有这个题
The professer mentioned some poets and poems ________ were unknown to us in his lecture.
A.which B.who C.that D.whom 为什么选that不选which?
I ‘m sorry but I wont have time to be with you until after 5:30 PM,_____I will have done all my work.
A.whose time B.at which timeC.on which D.by which time

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