導讀：詞組能有效的幫助大家提高完型和句子的理解與寫作質量，為保證大家能夠靈活運用考研重點詞組，社科賽斯李梅老師特配以相應的例句，幫助大家更快地獲得更高的分數(shù)。
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86. before long 不久以后
Before long he rebuilt a strong army and defeated the enemy.
不久之后，他重新建立了一支強大的軍隊并打敗了敵人。
87. belief in 對...的信仰，相信
You need an undying belief in your own ability.
你要堅定不移地相信自己的能力。
88. be beneficial to 對...有益，對...有利
It can be beneficial to share your feelings with someone you trust.
向自己信任的人傾訴感情是很有益處的。
89. beyond question 毫無疑問
It’s beyond question that she will succeed.
毫無疑問，她會成功。
90. be blind to 對...視而不見
All the time I was blind to your suffering.
一直以來，我都沒有意識到你遭受的痛苦。
