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 |
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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 |
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