---What ____ the population of China ?
---China has a population of 1.3 ____.
| A．is, billions | B．are; billions | C．is; billion | D．are; billion |
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---What ____ the population of China ?
---China has a population of 1.3 ____.
| A．is, billions | B．are; billions | C．is; billion | D．are; billion |
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