643.David threatened ______ his neighbour to the police if the damages were not paid.
A.to be reported
B.reporting
C.to report
D.having reported
644.________ many times,he finally understood it.
A.Told
B.Telling
C.Having told
D.Having been told
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643.David threatened ______ his neighbour to the police if the damages were not paid.
A.to be reported
B.reporting
C.to report
D.having reported
644.________ many times,he finally understood it.
A.Told
B.Telling
C.Having told
D.Having been told