46. Taipei 101 ____ the tallest building in the world, but it is still an important landmark in the city.
(A) has been
(B) used to be
(C) is
(D) is once
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統計: A(445), B(2488), C(246), D(277), E(0) #2702729
統計: A(445), B(2488), C(246), D(277), E(0) #2702729