She has never been to Tibet ______ .

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问题 She has never been to Tibet ______ .

选项 A、ago
B、before
C、in the past

答案B

解析 此句考查现在完成时。Has+过去分词是现在完成时的结构,而 ago和in the past是用在过去时中的,应该选[B]。
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