A number of birdwatchers ______in Zhalong Nature Reserve. The number of them____500.
| A．are, are | B．is, is | C．is, are | D．are, is |
A number of birdwatchers ______in Zhalong Nature Reserve. The number of them____500.
| A．are, are | B．is, is | C．is, are | D．are, is |
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