Various means of transportations (establish)______in this city so far.have been

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问题 Various means of transportations (establish)______in this city so far.

选项

答案 have been established

解析 首先根据时间状语so far“到目前为止”判定用现在完成时。又由于transportation与establish之间存在被动关系,所以要用被动语态。本题中主语means意为“方式,方法”,由various可知指多种方式,这里是复数的概念,因此助动词要用复数形式have。综上所述,此处填入have been established。
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