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No one (i)_____ that building a ship powered by black holes or dark matter would be a formidable task. Yet remarkably there seems to be nothing in our present understanding of physics that (ii)_____ our doing so.
Blank(i)Blank(ii)
A、believesD、anticipates
B、admitsE、necessitates
C、disputesF、precludes
答案：C,F

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