Last year the number of studects who graduated with a driving licence reached 200,000, a(n) ________of 40,000 per year.
| A．average | B．number | C．amount | D．quantity |
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Last year the number of studects who graduated with a driving licence reached 200,000, a(n) ________of 40,000 per year.
| A．average | B．number | C．amount | D．quantity |
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