______ recurring fear is out of proportion to any real danger, it is called a ph

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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、Whereas
C、Which
D、Whether

答案 A

解析 when作从属连词，引导状语从句，意为“当……的时候”，如：When AC flows through a coil，an alternating magnetaic field is generated around the coil.当交流电流通过线圈时，在线圈周围产生一交变磁场。

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