题目内容
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[单选题]
The key problem is ____ we must extend the validity date of the contract.
A.whom
B.that
C.which
D.what
提问人：网友后慧珍
发布时间：2022-01-07
如搜索结果不匹配，请 
A.capacity
B.inability
C.capability
D.mobility
题目内容
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