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

A．changes; cities	B．changed; city
C．has changed; cities	D．changed; cities

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

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