burnrohan wrote:
Black holes, collapsed stars whose massive gravitational pull traps even light,are invisible to telescopes but have been detected by sighting the swirling eddies of gas being swallowed by the black holes.
A. are invisible to telescopes but have been detected by sighting
B. is invisible to telescopes but detectable by sighting
C. are invisible to telescopes but detectable by the sight of
D. are invisible to telescopes but were detected by the sight of
E. is invisible to telescopes even though
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