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19. In today's fast changing and competitive world, to be able to learn faster and more effectively is not merely desirable; it is   .

A. essential     B. worthwhile

C. challenging     D. sufficient

19. A考查形容词辨析。句意:在今天这个快速变化和有竞争力的世界中,能够学得更快、更有效不仅是可取的,也是基本的。essential基本的;worthwhile值得的;challenging有挑战的;sufficient充分的。选A。

题目来源:2015全品语法快练高中英语新课标 > 训练6 介词、形容词、副词、动词及词组

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