Scientists estimate that about 530,000 other objects, too small to detect with radar, ______ the Earth too.

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问题 Scientists estimate that about 530,000 other objects, too small to detect with radar, ______ the Earth too.

选项 A、being circled
B、are circling
C、are to be circling
D、are being circled

答案B

解析 分析句子结构可知,that引导的宾语从句中缺少谓语,再结合句意可知,本句应用现在进行时的主动语态。故选B。
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本试题收录于: 英语题库普高专升本分类
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