问题补充：
—Guess what? Tom has failed in the exam second time.
—How come? He is second to none in English in our class.
A. a; a
B. the; a
C. a; /
D. the; the
答案：
A. a; a
B. the; a
(答案→)C. a; /
D. the; the
解析：考查冠词。句意：-猜猜发生什么事情了？Tom又一次考试不及格：-怎么可能？他可是我们班级英语首屈一指的优秀生啊！序数词前面加不定冠词表示再一，又一；（a second time再一次）；固定词组second to none首屈一指； 选C
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