The maths problem remained confusing to the boy although _______ over and over.A
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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 |
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答案
| C |
解析
| although引导让步状语从句，主从句主语一致，从句谓语动词为be动词，可将主语和谓语动词be一并省略,补全后为:...although it was explained...。 |
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