问题
选择题
______ the 632-meter Shanghai Tower is finished, it will be the second tallest building in the world.[ ]
A. When
B. Since
C. Before
D. Unless
答案
答案：A
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______ the 632-meter Shanghai Tower is finished, it will be the second tallest building in the world.[ ]
A. When
B. Since
C. Before
D. Unless
答案：A