______recurring fear is out of proportion to any real danger, it is called a phobia.

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问题 ______recurring fear is out of proportion to any real danger, it is called a phobia.

选项 A、When
B、While
C、Which
D、Whereas

答案A

解析 本题考查句子结构。分析句子结构可知,逗号后为主句,前面应该是状语从句。根据句子内容可知,从句内容是形成“恐惧症”的条件。四个选项中,能够引导状语从句且表示条件的只有when,故答案为[A]项。when在此虽然引导时间状语从句,但是功能和含义相当于if。
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