—Important______his discovery was, it was regarded as a matter of no account ...

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问题 —Important______his discovery was, it was regarded as a matter of no account in his time.

选项 A when
B until
C as
D although

答案C

解析即便他的这个发现很重要,但这还是被当作是他的一生中不值得一提的事情。
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