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[单选题]
The research is so designed that once ________ nothing can be done to change it.
A
begins
B
having begun
C
beginning
D
begun
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参考答案
试题答案:
D
答案解释:
“连词+分词”作状语时,其逻辑主语为句子的主语。句子主语与分词的之间是主动关系时用现在分词,被动关系用过去分词。the research与begin是被动关系,因此用过去分词begun。
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