Engineering is ______ challenging course of study that requires ______ thoroughunderstanding of mathematics and science.
A．the; aB．a(chǎn); theC．不填；不填D．a(chǎn); a
D

試題分析：考查冠詞的用法區(qū)別。第一空course是課程，前面有challenging修飾，故表示泛指；第二空表示對(duì)某物的理解，understanding前加a,故D正確。
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