The dense Belgian fogs is caused by the cooling of humid surface air to a relati

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问题 The dense Belgian fogs is caused by the cooling of humid surface air to a relatively low temperature.

选项 A、must cause
B、will be caused
C、are caused
D、has been caused

答案 C

解析结构应用本句主语为fogs，是复数，表示：比利时的浓雾是由于湿润的地面空气冷却到一个相对较低的温度后形成的；应用一般现在时的被动语态，因此C为答案。

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