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【单选题】

Great changes______ in the city since1970.

A.
have been taken place
B.
have taken place.
C.
has taken place
D.
took place
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参考答案:
参考解析:
.
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【单选题】单项选择。You look so tired and sad! ______.[ ]

A.
What happened?
B.
What did you do?
C.
What was it?
D.
What?