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<綜合測驗>第16至20題為題組
Bill and Sam decided to kidnap the son of a banker to compensate for their business loss. They kidnapped the boy and hid him in a cave. They asked for a ransom of $2，000 to return the boy. ___16___， their plan quickly got out of control.
(A) However
(B) Otherwise
(C) Furthermore
(D) Accordingly