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

C 【解析】句意“許多年前,一個(gè)蘋(píng)果落下打在牛頓頭上,他感到很奇怪,并發(fā)現(xiàn)了牛頓萬(wàn)有引力”。根據(jù)many years ago可知,用過(guò)去時(shí),故選C。
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