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Not having studied his lessons well,he failed in the exam.可否说Haven't studied his lessons well,是因为做状语所以要用ing吗?

题目详情
Not having studied his lessons well,he failed in the exam.可否说Haven't studied his lessons well,
是因为做状语所以要用ing吗?
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答案和解析
因为前句的主语也为he,所以把he省掉,动词不能放在句首,所以加ing做状语放在句首