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As is known to us all, _____ tiger is in _____ danger of becoming extinct.

A. the, a              B. the, 不填   C. a, 不填           D. 不填, the

As is known to us all, _____ tiger is in _____ danger of becoming extinct.

A. the, a  B. the, 不填  C. a, 不填     D. 不填, the

As is known to us all, _________ tiger is in _________ danger of becoming extinct.

A. the, a  B. the, 不填   C. a，不填     D. 不填，the

As is known to us all, _____ tiger is in _____ danger of becoming extinct.

A. the, a   B. the, 不填   C. a, 不填    D. 不填, the

As is known to us all, _____ tiger is in _____ danger of becoming extinct.

   A. the, a     B. the, 不填     C. a, 不填    D. 不填, the