一問よろしくお願いします。
Canadian scientists have calculated that <one human
being should be struck every nine years by a meteorite>,
while each year sixteen buildings can be
expected to sustain damage from such objects.
(C)a meteorite will strike one human being once in every nine years
(D)every nine years a human being will be stuck by a meteorite
正解は(D)でしたが、理由および両者の意味の違いがよくわかりません。
once in every nine yearsと、文頭のevery nine yearsではどのような違いがあるのでしょうか?
よろしくお願いします。
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