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by crashing against seashores

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by crashing against seashores
Only by crashing against seashores,__________ sand away from some beaches and pile it up on other beaches.
A.do the waves take B.the waves take
C.take the waves D.takes the waves
为什么答案是A
by crashing against seashores
额……only 位于句首修饰从句要采用倒装语序.
A答案,助动词do提前,do the waves take为倒装.
另外的例子:Only in this way can you come up with a solution to the problem.
                      (can you也是用了倒装形式)
       但是,only 修饰主语时,句子不倒装.
如:Only he knew how to solve the problem.
        只有他知道怎么解决问题.