问题
选择题
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
答案
答案：D
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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
答案：D