The first textbooks __________ for teaching English as a foreign language came out in the 16th century.
| A．having written |
| B．to have written |
| C．being written |
| D．written |
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The first textbooks __________ for teaching English as a foreign language came out in the 16th century.
| A．having written |
| B．to have written |
| C．being written |
| D．written |
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