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Learning how to study English well takes a long time .(改为反意疑

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Learning how to study English well takes a long time .(改为反意疑问句)
Learning how to study English well takes a long time ,______ ________?
Learning how to study English well takes a long time .(改为反意疑
doesn't it?
动名词作主语,后用it代替
takes花费.是实义动词,后应加助动词does
前肯定,后否定