Geologists suggested that the region might in fact be more susceptible to earthq

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问题 Geologists suggested that the region might in fact be more susceptible to earthquakes than______.

选项 A、previously been believed
B、it had previously believed
C、did it previously believe
D、had previously been believed

答案 D

解析句意：地质学家表明，该地或许比之前所想象的更易发生地震。than前后表示同一事物的比较，因此than之后的主语it(指代“the region”)可省。因其与believe为被动关系，排除B项和C项。A项been believed不能单独作谓语，排除。因此答案选D。

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