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Questions and exercises are given by the computer, which decides to move the stu

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Questions and exercises are given by the computer, which decides to move the stu

Questions and exercises are given by the computer, which decides ________ to move the student ahead, review an easier level, ________ give more work on the same level.

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A.either, orB.both, and C.whether, orD.not only, but

试题答案

答案:C