Question

6. The only way to succeed at the highest level is to have total belief ______________you are better than anyone else on the sports field.

Answer 1

6.  that句意：在最高水平比赛中成功的唯一途径是完全相信你在运动场上比其他任何人都优秀。belief后所接的从句是对其内容进行解释说明，是同位语从句，从句中不缺少成分， 所以用that引导。