There are many birds flying ___ the sea.填什么介词?A .on B.over C.in D.through

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There are many birds flying ___ the sea.填什么介词?
A .on B.over C.in D.through

B
on是在表面,要接触
over是在垂直上方
in在里面
through是通过,如穿过门,森林之类