20．It was four o'clock in the afternoon_____he and his grandpa reached the museum in Guanghan, _____an official warmly received them.
| A．that; where | B．when; that | C．when; where | D．that; when |
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20．It was four o'clock in the afternoon_____he and his grandpa reached the museum in Guanghan, _____an official warmly received them.
| A．that; where | B．when; that | C．when; where | D．that; when |
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