Many teenagers feel lonely, no one understands them and the changes they are going through.
A. as if
B. like if
C. because of
D. for that
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(答案→)A. as if
B. like if
C. because of
D. for that
解析：考查as if的用法：as if是“好像”引导状语从句，句意：很多年轻人感到孤单，好像没有人理解他们和他们经历的改变。BD表达不对，C项是介词短语“因为”，选A。