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My parents were quarrelling about me _____ I could not quite tell why.

A. since           B. though      C. if             D. until

 My parents were quarrelling about me ____ I could not quite tell why.

    A．since          B．though          C．if               D．until

My parents were quarrelling about me ____ I could not quite tell why．

A. since                 B. though                     C. if                      D. until

My parents were quarrelling about me________I could not quite tell why．

A．since 　　 B．though　 　 C．if　 　　　 D．until

黑龍江哈九中2011屆高三上學期期末考試

My parents were quarrelling about me________I could not quite tell why． 

       A．since       B．though          C．if          D．until