问题描述：
请告诉我原因为什么第一题选A, 第二题选 A.
1__ tallest building in the town is ___ Bank of China.
A: The, the B: A, a C: The, a D: A, the
2. Mary is ___ only girl who has been to America.
A: the B: an C: a D: /
1__ tallest building in the town is ___ Bank of China.
A: The, the B: A, a C: The, a D: A, the
2. Mary is ___ only girl who has been to America.
A: the B: an C: a D: /
问题解答：
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