【C5】A．SinceB．After a whileC．AgainD．Before long

【C5】A．beforeB．whileC．whenD．after

【C5】A．SinceB．AsC．ThereforeD．Although

【C14】A．before longB．after longC．long beforeD．long after

【C5】A．no longerB．for longC．before longD．long before

【C6】A．sinceB．whileC．whereasD．before

【C5】A．sinceB．soC．andD．but