Generally speaking, students’ inner motivation with high expectations from others essential to their development.
A. is
B. are
C. was
D. were
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(答案→)A. is
B. are
C. was
D. were
解析：句意：一般来说,学生的从别人对他们高的期望获得的内在动机对他们的发展至关重要。句子的主语是motivation，不可数名词，谓语用单数形式，故排除BD。根据Generally speaking可知本句用一般现在时。故选A。