在工程竣工后的（）内，城建档案馆对工程档案进行正式验收。
A、1个月
B、45天
C、3个月
D、6个月
参考答案：C
_____ China has become a member of WTO, English is more popular than before.[ ]
A. Since
B. Though
C. Whether
D. If
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