most efficient way to understand thousands of new words is to gain good knowledge of basic word information.
A. A; a.
B. The; /
C. A; /
D. The; the
网友回答
(答案→)A. A; a.
B. The; /
C. A; /
D. The; the
解析：考查冠词。第一空的a与most连用表示，非常，十分；第二空是固定词组gain a good knowledge of掌握…；句意：一种理解单词非常有效的方法就是掌握基本的构词法。故A正确。