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A series of attempts______made, he came to realize that he had underestimated th
A series of attempts______made, he came to realize that he had underestimated th
游客
2025-04-06
23
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问题
A series of attempts______made, he came to realize that he had underestimated the enormity of the task.
选项
A、were
B、to be
C、had been
D、having been
答案
D
解析
语法知识。空格处是分词的独立主格结构做状语的用法,如果选择选项A与选项C原句就出现两个谓语而没有连词连接,不符合句法。选项B表示一般时态,而根据语境,一系列的尝试在认识到问题之前,空格中应使用过去完成时态结构。只有D选项是分词过去时态表被动。故答案为D。
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