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The water will be further polluted unless some meansures______ in the future.
A.will be taken
B.have been taken
C.were taken
D.are taken
答案是D,为什么?
Although he knew little about the large amount of work done in the field,he succeeded_______other better-informed experimenters failed.
A.in which
B.that
C.the place where
D.where
答案是D,为什么?
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