23．Questions and exercises are given by the computer, which decides to move the student ahead, ——青夏教育精英家教网—

摘要：23．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. A．either; or B．both; and C．whether; or D．not only; but also

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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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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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