问答题

A telephone user may pay a fixed monthly charge and (allow)（）to make an unlimited number of　local calls in the month．

答案：正确答案：be allowed

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Believe it or not，when first (introduce)（）to Europe，tomato was thought to be poisonous．

答案：正确答案：introduced

Karl probably (see)（） Star Wars several times, for he knows every detail of the film．

答案：正确答案：has seen