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题目内容
（东华大学大学英语4）
160. Important ________ his discovery might be, it was regarded as a matter of no account in his time. 虽然他的发现很重要，但是在他那个时代，这个发现被认为毫无价值。
A. when B. until C. as D. although
A. when B. until C. as D. although
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