Xiamen Xiang'an Tunnel, _____ is the first undersea tu
nnel built in mainland China, opened to traffic on April 26th．
| A．that | B．what | C．where | D．which |
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Xiamen Xiang'an Tunnel, _____ is the first undersea tunnel built in mainland China, opened to traffic on April 26th．
| A．that | B．what | C．where | D．which |
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