第一道B 问句是完成时 回答not yet 是完成时的否定 故选择B
第二道B 不定式（不知道是不是这个知识点,或者是固定的be one's turn to do sth）
第三道D been 是延续性动词,其他的都是暂短性动词 不能用于完成时的句子
这里只能用延续性动词,因为后面有“for three days”
第四道C 基础知识点 没什么好说
1.---Have you traveled to any foreign countries so far?
4个回答
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