Beijing ______a lot in the past ten years. Now it has become one of the biggest modern______ in the world. 
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A
changes, cities
B
changed, city
C
changed, cities
D
has changed, cities
推荐题目
His grandma has_______ for 5 years.
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A
died
B
be died
C
been died
D
been dead
I asked the teacher if there        an English test the next day.
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A
would be
B
will be
C
will have
D
would have