题文
At the beginning of the twentieth century,___the population all over the world?
| A．what was |
| B．what were |
| C．how many are |
| D．how much is |
推荐试卷
At the beginning of the twentieth century,___the population all over the world?
| A．what was |
| B．what were |
| C．how many are |
| D．how much is |
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