Engineering is ______ challenging course of study that requires ______ thoroughunderstanding of mathematics and scienceA.the; aB.a; theC.不填;不填D.a; a
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D解析试题分析:考查冠词的用法区别。第一空course是课程,前面有challenging修饰,故表示泛指;第二空表示对某物的理解,understanding前加a,故D正确。考点:考查冠词的用法区别。