By 2011 the library_____.A.would been built B.had been built C.ha_其他解答

By 2011 the library_____.A.would been built B.had been built C.has been built D.have been built

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解答

B 因为A是将来时,B是过去式,C是现在完成时表示已做,（单数）D是现在完成时（复数）