问题
选择题
——_____was the Nanjing-Changjiang Bridge open to traffic?
——It was open to traffic in 1968.
A．What
B．What time
C．How long
D．When
答案
答案：D
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——_____was the Nanjing-Changjiang Bridge open to traffic?
——It was open to traffic in 1968.
A．What
B．What time
C．How long
D．When
答案：D