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22. I’ve already told you that the fourth and last part of the article ______ the most difficult to understand.
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21. Play, often seen as ______activity for kids, is still important in _______ development of teenagers.
A. the; the B. an; the C. an; ²»Ìî D. the; ²»Ìî
22. I’ve already told you that the fourth and last part of the article ______ the most difficult to understand.