I suppose we’ll have to, bad weather conditions, spend more than 500 days undertaking the construction.
A. considering
B. allowed for
C. including
D. linked with
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(答案→)A. considering
B. allowed for
C. including
D. linked with
解析：本题考查动词。considering the weather condition插入语, 句意：考虑到天气原因,我认为我们需要花超过500天的时间来进行建设。