As is reported, it will be more than 20 years humans are able to walk on Mars.A．before B．when C．since D．after 题目和参考答案——青夏教育精英家教网—

题目内容

As is reported, it will be more than 20 years ________ humans are able to walk on Mars.

A．before B．when C．since D．after

【解析】

试题分析: 句意：据报道，还要20年的时间人类才能够在火星上行走。A在之前；B当…..时候；C自从；D在之后。固定句型：It will be +时间段+before“还要多久才”，选A。

考点：考查连词辨析

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近年来, 随着私家车的增加, 城市交通越来越拥挤。在中、小学生上学或放学时, 校门口以及学校附近拥挤问题更加严重。这给学生、教师、家长和其他市民带来许多不便。尤其值得注意的是, 学校附近的交通堵塞也存在不可忽略的隐患。为此, 这引起了不少民众的担忧。你作为一名在校学生, 署名张小明, 根据以下要点写一封英语信, 向本校英语报投稿。

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