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题目内容
（国家开放大学开放英语）
There are many cities __________________ very fast.
单选题 (2 分) 2分
A.
expand
B.
which expand
C.
which expanding
D.
to expand
单选题 (2 分) 2分
A.
expand
B.
which expand
C.
which expanding
D.
to expand
参考答案
