A series of attempts______made, he came to realize that he had underestimated th

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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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