An apple ______ from the tree and hit on Newton’s head many years ago . He felt strange and appeared
An apple ______ from the tree and hit on Newton’s head many years ago . He felt strange and appeared “Newton physical gravity” .
A. is falling B. falls C. fell D. falling
【答案】C
【解析】句意“许多年前，一个苹果落下打在牛顿头上，他感到很奇怪，并发现了牛顿万有引力”。根据many years ago可知，用过去时，故选C。
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