Beijing ________ a lot over the years. Now it has become one of the biggest
______ in the world.

A．changes; citiesB．changed; city
C．has changed; citiesD．changed; cities

C

解析試題分析：句意：這些年北京變化很多�，F(xiàn)在它已經(jīng)成為世界最大的城市之一。與時間短語over the years.連用時，用現(xiàn)在完成時。由one of來修飾時，后面用名詞的復(fù)數(shù)形式。故選C。
考點：考查時態(tài)的用法。

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