American students take part in a wide variety of after-school activities they develop their social skills.
A. where
B. which
C. that
D. what
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(答案→)A. where
B. which
C. that
D. what
解析：考查定语从句。题意：美国学生有许多课外活动，从中锻炼社会技能。活动是锻炼技能的“场所”，故定语从句用where引导。A项正确。