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

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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