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[主观题]
Not a______has been found so far that can help the police find the criminal.A.factB.clueC.
Not a______has been found so far that can help the police find the criminal.
A.fact
B.clue
C.symbol
D.sign
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Not a______has been found so far that can help the police find the criminal.
A.fact
B.clue
C.symbol
D.sign
A.will be
B.would be
C.has been
D.will have been
(The metal) aluminum (has been) (first) isolated (early) in the nineteenth century.
A.The metal
B.has been
C.first
D.early
A.authorizing
B.authorize
C.be authorized
D.have been authorized