Unit 8 is eighth unit and Unit 9 is the ninth.这一句哪错了、有一个部分、?
问题描述：
Unit 8 is eighth unit and Unit 9 is the ninth.这一句哪错了、有一个部分、?
答
Unit 8 is (the) eighth unit and Unit 9 is the ninth.
表示序数,则序数词前面要加the
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