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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


解析:

:whether····or····表选择。问题的给出是为了决定是提高水平还是做同一水平的题。故选C。

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