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The maths problem remained confusing to the boy although _______ over and over.

A. explaining B. being explained?

C. explained D. having explained?

C?


解析:

although引導讓步狀語從句，主從句主語一致，從句謂語動詞為be動詞，可將主語和謂語動詞be一并省略,補全后為:...although it was explained...。

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