the difficulty lies _____we have no money.A in that B in the fact that

答案是in the fact that
that作介词的宾语只用于except that(除了),in that（因为）这两种结构,而本题in是lie in 的搭配,that不能用于lie in 后.
答案B中,the fact 作lie in 的宾语,that 是the fact的同位语.能给举个例子that 从句做in 的宾语吗This book is different from that book in that this one is about chemistry and that one about history. 这本书不同于那本,因为这本是有关化学的,而那本是有关历史的。 （并不是所有的in后都能加that，你可以把in that当固定搭配来记。）