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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.
admin
2013-10-17
11
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
本题测试句子结构以及句子的时态语态问题。首先句子填入的成分应该做that引导的宾语从句中的谓语,所以我们一开始就可以排除选项A。再根据句子意思判断物体 (objects)环绕地球应该采用主动语态,而且这个动作应该是正在进行并且要一直持续下去的,故可以排除掉C(be to do表示将来的动作)和D(被动语态)。
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