they are sure that they can solve all the problems( )three hours A,with B,on C,in D,for

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they are sure that they can solve all the problems( )three hours A,with B,on C,in D,for
they are sure that they can solve all the problems( )three hours A,with B,on C,in D,for

they are sure that they can solve all the problems( )three hours A,with B,on C,in D,for
C
根据语境是表示将来的行为,而“in+时间”在将来时表示“一段时间之后”,符合句意.
他们确信,他们能在三小时后解决所有问题.

选C 在三个小时内他们可以解决所有的问题
如果有within也是可以用的