Questions and exercises are given by the computer, which dec

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Questions and exercises are given by the computer, which decides ________ to move the students ahead, review an easier level,________ give more work on the same level.
A. either; or B. both; and
C. whether; or D. not only; but also

C 根据句子意思的要求,有“是否是.还是.”,其它的几个关联连词词义不符合要求.
问题和练习题由计算机提供,计算机来盘点是否让学生们往前学,复习一个更容易的级别,还是在同一个级别里给出更多的学习任务.

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