请教一个英语问题属于哪个语法点 为什么选这个答案,on the ocean floor .

题目

请教一个英语问题属于哪个语法点 为什么选这个答案,on the ocean floor .
On the ocean floor .However,to bring them to the surface requires expensive equipment and trained people.
A do some sunken ships lie B some sunken ships do lie
C lie some sunken ships D some sunken ships lie

答案

选C lie some sunken ships 这里的语言点是：On the ocean floor lie some sunken ships.是倒装句,正常语序是：some sunken ships lie on the ocean floor.当介词短语或副词作为状语时,为了平衡结构,或强调状语,可将...