[单选题]
The moon was obscured by thick clouds.
A、held
B、prevented
C、darkened
D、blackened

参考答案:B

参考解析:
句意为：厚厚的云朵遮住了月亮。prevent意为“预防、阻止”，hold意为“持有、保留”，darken意为“使模糊、变黑”，blacken意为“使变黑、诽谤”。obscure意为“遮掩，使变暗”。和B项同义，故选B项。

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