【题目】It is common for teenagers to feel lonely and. These feelings can be thought of as growing pains.
A.misunderstanding
B.misunderstood
C.to misunderstand
D.having misunderstood

【答案】B
【解析】句意：青少年感到孤独和被误解是常见的事。这些感觉可以被认为是成长的痛苦。此处是过去分词做表语。故选B。