Among the 15-year-old children, some        studying in university while others are still learning to read and write.
A．should have beenB．would have beenC．can beD．must be
C
考查情態(tài)動(dòng)詞。句意：在十五歲的孩子中間，一些可能在大學(xué)學(xué)習(xí)，然而另一些仍舊在學(xué)習(xí)讀寫。選項(xiàng)AB為虛擬語氣，選項(xiàng)D為肯定推斷，結(jié)合語境可知選C。
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