2. 外语
  3. Before paper was invented, people wrote on ______could obtain: silk, palm leaves, or clay tablets.

Before paper was invented, people wrote on ______could obtain: silk, palm leaves, or clay tablets.

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问题 Before paper was invented, people wrote on ______could obtain: silk, palm leaves, or clay tablets.
选项 A、what
B、whatever
C、whatever they
D、they
答案C
解析 The preposition on needs a noun structure as its object; whatever they is the beginning of a noun clause.
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