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After ________ series of unsuccessful attempts,he has finall

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After ________ series of unsuccessful attempts,he has finally passed ________driving test.
A./;the
B.a; the
C.the; a
D./;a
答案B
本题考查冠词.a series of是固定短语,意为“一系列;一连串”,所以第一空用不定冠词a;第二空用定冠词the,特指驾驶考试.句意:经过连续几次的失败,他最终通过了驾驶考试.