I didn’t know ________.
| A．when did the plane take off |
| B．when the plane took off |
| C．when the plane takes off |
| D．when does the plane take off |
I didn’t know ________.
| A．when did the plane take off |
| B．when the plane took off |
| C．when the plane takes off |
| D．when does the plane take off |
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