Their demand is the good use we ________ our spare time for our study of science and technology．A.make fromB.make ofC.make outD.make into
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B解析考查词语的用法和词组辨析。句译为：他们要求我们好好利用业余时间学习科学技术。本句实际上是“Their demand is the good use(that)we should make of our spare time for our study of science and technology．”, make use of是固定短语，其中that引导的定语从句修饰先行词use，that在从句中作of的宾语。