American students take part in a wide variety of after-school activities they develop the

问题补充：

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

答案：

(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。