Because of ______ high demand for Type AB blood, ______ supplies of it are usually limited.

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

Because of ______ high demand for Type AB blood, ______ supplies of it are usually limited.

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

Because of ______ high demand for Type AB blood, ______ supplies of it are usually limited.

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

Because of ______ high demand for Type AB blood, ______ supplies of it are usually limited.

1. A.
   the; the
2. B.
   不填; 不填
3. C.
   不填; the
4. D.
   a; the