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 非谓语动词用法题。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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