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16.I have bought the same dress ____she is wearing. A.as B.that C.which Dthan 17.Can you solve such problems ___raised by the audience? A.what were B.as were C.that were D.which were 18.The reason ___he didnt come was ____he was injured. A.that,because B.why,that C.why, because D.that, that 19.He must be from Africa, ____can be seen from his skin. A.that B.as C.it D.what 20.His father died last year, ____made it impossible for him to go abroad. A.when B.which C.as D.that 21.___is natural,he married Mary. A.It B.What C.Which D.As 22.The buses, ____were already full,were surrounded by an angry crowd. A.most of them B.most of which C.which most D.that most 23.All___is needed is a supply of oil. A.the thing B.that C.what D.which 24.He paid the boy 10 dollars for washing ten windows,most of ___had not been cleaned for years. A.these B.those C.that D.which 25.In the dark street,there wasnt a single person ______she could turn for help. A.that B.who C. from whom D.to whom 26. This is one of the means ____the electic energy is conducted from one place to another. | 
