--Do you know _______ No. 1 Middle School?
--Next Friday.
| A．when will they visit | B．when they will visit |
| C．when did they visit | D．when they visited |
--Do you know _______ No. 1 Middle School?
--Next Friday.
| A．when will they visit | B．when they will visit |
| C．when did they visit | D．when they visited |
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