we did not find --- to prepare for the worst conditions we m

答案C。（it worthwhile）句型是形式宾语句型：V + it + adj。+ to do此题区别worth、worthy、worthwhileworth句型是sth is worth doing;worthy句型是sth is worthy to be done或者是sth is worthy of being done;worthwhile句型是it is wothwhile to do/doing。