71. The Science Building is very beautiful, behind ______ there is an orchard.
A. which B. what C. this D. these
72. Joan is one of the best writers who ______ published a lot of books.
A. has B. have C. have been D. are
73. When they met again, the two friends talked about lots of things and persons ______ we could remember in the school.
A. who B. whom C. that D. which
74. He is ______ everyone respects.
A. the person B. the one which C. whom D. who
75. This is the modern hotel ______ the guests can enjoy the most comfortable things.
A. where B. which C. that D. in that
76. July 27, 1989 is the day ______ I will never forget, when we had a wonderful time.
A. on which B. when C. whom D. that
77. Both of them will remember the months and the years ______ they spent in the army.
A. which B. when C. in which D. what
78. It is the factory ______ produces all kinds of TV sets.
A. in which B. which C. what D. where
79. The sun is bigger than the earth, ______ even a child knows.
A. that B. who C. as D. what
80. Miss Zhang devoted herself to the development of education, ______ led to her final success.
A. that B. which C. so that D. so
答案：71-75 ABCAA 76-80 DABCB