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(2013·江苏,21)Generally,students' inner motivation with high expectations from others________essential to their development.
A.isB.areC.wasD.were
A

考查主谓一致和动词时态。主语为motivation,故谓语为单数;根据语境及generally可知,描述的为一般情况,故使用一般现在时态,选A。
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