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
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
