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题目释义:Citing A, B, C, and D, a study of sth. has estimated that…
选项分析
A. 句子合理重心应该是结论为主句,达成结论的动作过程为辅,所以主从颠倒;定语从句中的they无所指。
B. Correct;Citing在句首,a new study是逻辑主语也是主语;句子重心合理。
C. citing逻辑主语错误,同时致使本应该是核心成分的a new study estimates成了插入语;estimates用现在完成时或者一般过去时问题都不大。
D. 句子重心错误;votes that were cast累赘,因为时态一致,可以省略that were;had been过去完成时错误,没有时间对比说明count这个动作发生在过去的过去(即便count是个瞬间动词,但是在否定句中瞬间动词也可以和表示一段时间的状语、连词连用,而是用完成时态)。
E. had not been时态错误;主谓相隔太远不好;复杂的句式estimate后面补出that更好。

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