— How long has the Scientific Museum in Chongqing been open to the public?
— For more than 2 months since _____.

A. it was completed
B. it completed
C. it has been completed
D. it has completed
A
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— How long has the Scientific Museum in Chongqing been open to the public?
— For more than 2 months since _____.
[     ]
A. it was completed
B. it completed
C. it has been completed
D. it has completed

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