题文
---A number of volunteers______ willing to teach in China`s rural areas.
---Yes, the number is getting_______.
| A．is; bigger and bigger |
| B．are; bigger and bigger |
| C．is; more and more |
| D．are; more and more |
---A number of volunteers______ willing to teach in China`s rural areas.
---Yes, the number is getting_______.
| A．is; bigger and bigger |
| B．are; bigger and bigger |
| C．is; more and more |
| D．are; more and more |
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