As is known to us all, tiger is in danger of becoming extinct. A. the, aB. the, 不填C. a,

发布时间：2020-08-17 12:49:18

As is known to us all,      tiger is in      danger of being extinct.
A. the, a
B. the, 不填
C. a, 不填
D. 不填, the

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A. the, a
(答案→)B. the, 不填
C. a, 不填
D. 不填, the
解析：当概括事物的种类时，用定冠词，不用不定冠词；另外in danger of 是短语，不用冠词。
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