No one could tell exactly that what _____(happen)in the next century

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Noonecouldtellexactlythatwhat_____(happen)inthenextcenturyNoonecouldtellexactlythatwhat_____(happen)

No one could tell exactly that what _____(happen)in the next century
No one could tell exactly that what _____(happen)in the next century

No one could tell exactly that what _____(happen)in the next century
would happen
因为是next century 是将来时,而主句couldb表明说话时为过去式,所以总体是过去将来时.

happened

would happen甚好

应该用would happen。首先由could决定句子为过去时态,然后next century说明需要表达将来的意思,所以应该用过去将来时态