Beijing ______a lot in the past ten years. Now it has become one of the biggest modern______ in the world.
| A．changes, cities | B．changed, city | C．changed, cities | D．has changed, cities |
Beijing ______a lot in the past ten years. Now it has become one of the biggest modern______ in the world.
| A．changes, cities | B．changed, city | C．changed, cities | D．has changed, cities |
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