题文
________ tigers in the world has reduced(减少) in the last fifty years．
| A．A number |
| B．The number |
| C．A number of |
| D．The number of |
________ tigers in the world has reduced(减少) in the last fifty years．
| A．A number |
| B．The number |
| C．A number of |
| D．The number of |
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