Scientists estimatethatabout 530,000 objects, too small to detec

作者:高老师 浏览 1

Scientists estimatethatabout 530,000 objects, too small to detect with radar, ________theEarth too.
A、 being circled
B、 are circling
C、 are to be circling
D、 are being circled
【正确答案】:B

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