18、Tom often has to be called several times ______ he comes downstairs for dinner．
A． before B． until C． when D． then
科目：高中英語 來源： 題型：
Tom often has to be called several times _______he comes downstairs for dinner．
A．before B．until C．when D．then
科目：高中英語 來源： 題型：
Tom often has to be called several times ______ he comes downstairs for dinner．
A． before B． until C． when D． then
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