My sister is . She likes making friends with others.A. shyB. quietC. athleticD. outgoing

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A. shy
B. quiet
C. athletic
(答案→)D. outgoing
解析：句意：我妹妹是外向的。她喜欢和别人交朋友。A. shy害羞的；B. quiet安静的；C. athletic运动的；D. outgoing外向的。根据她爱交朋友这个特点，可知她是外向的，故选D。