2. 外语
  3. Believe it or not, when first ______ to Europe, tomato was thought to be poisonous.

Believe it or not, when first ______ to Europe, tomato was thought to be poisonous.

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问题 Believe it or not, when first ______ to Europe, tomato was thought to be poisonous.
选项 A、to introduce
B、introducing
C、introduced
D、to be introduced
答案C
解析 过去分词常表示被动意义，本题主语tomato是动作introduce的承受者，为被动关系，故introduced正确。to be introduced虽有被动含义，但是表示尚未完成的动作，与was thought不一致。
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