Questions and exercises are given by the computer, which decides ______ to move the students ahead,

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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

题型：单选题难度：偏易来源：不详

答案

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。

上一篇 : _____ he had not been ill ,
下一篇 : Never let your mind wander

Questions and exercises are given by the computer, which decides ______ to move the students ahead,

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