2. 专升本
  3. The invention of coins appears______at almost the same time but quite independently in Greece and China in about 700 B.C.

The invention of coins appears______at almost the same time but quite independently in Greece and China in about 700 B.C.

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问题 The invention of coins appears______at almost the same time but quite independently in Greece and China in about 700 B.C.
选项 A、to happen
B、to have happened
C、happen
D、happened
答案B
解析 本题考查不定式的时态。“appear+动词不定式”构成复合谓语，意思是“开始出现，开始发生”。在本句中动词不定式的动作或状语先于谓语动词appear发生，故用动词不定式的完成时。
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