Nearly half a million immigrants，many of them English—speaking， in the country during the last quarter of the nineteenth century．
| A．have arrived | B．had arrived |
| C．arrived | D．have been arriving |
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Nearly half a million immigrants，many of them English—speaking， in the country during the last quarter of the nineteenth century．
| A．have arrived | B．had arrived |
| C．arrived | D．have been arriving |
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