Play, often seen as activity for kids ,is still important in development of teenagers.A.

Play, often seen as activity for kids ,is still important in development of teenagers.
A. the ; the
B. an; the
C. an ;不填
D. the；不填

A. the ; the(答案→)B. an; theC. an ;不填D. the；不填解析：考查冠词。activity是一个可数名词；development是特指年轻人的发展，是特指所以用the;句意：通常被看成是一种儿童活动的玩耍在年轻人的发展中仍然很重要。

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