Scientists have discovered amazing evidence showing how the human body rebuilds _______ while we sleep.
A．usB．ourselvesC．itD．itself
Ｄ
考查反身代詞用法.根據(jù)題意,科學家發(fā)現(xiàn)了驚人的證據(jù),證明了當我們睡著時人類身體是如何修復自身的.句中反身代詞指代人的身體本身,故用itself,選D.
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