______when he started the research, he never gave up trying new ways to increase the production.

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问题 ______when he started the research, he never gave up trying new ways to increase the production.

选项 A、How old he was
B、As he was old
C、However old was he
D、Old as he was

答案D

解析 本题考查状语从句的用法。选项A引导的从句是一个名词性从句,不能充当状语,而这个句子并不缺少名词充当的成分。选项B引导的从句是一个状语从句,as引导的状语从句一般表示时间或原因,如果从全局内容来看,时间或原因在逻辑上明显不对: “由于他开始做研究工作时年岁已经很老了,他从来没有放弃过尝试使用新的方法提高产量”。选项C引导了一个让步状语从句,但语序不正确。选项D引导的也是一个让步状语从句,当用as引导让步状语从句时,形容词、副词或动词需要提到句首,即采用倒装的方式。因此本题正确选项应该是D。
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