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第2题
A、down
B、in
C、off
D、up
第3题
A、lest
B、if
C、unless
D、provided
第4题
A.It is usually considered as the most important sentence of the essay.
B.It defines the writer’s position on the subject.
C.It cannot be changed once it is formulated.
D.It usually appears at, or near, the end of the introductory paragraph of the paper.
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