题目内容
19.More than 20million people have used the public bicycles in Beijing since they _______ available in 2011.( )A. | made | B. | have been made | C. | have made | D. | were made |
分析 在北京超过2000万人使用公共自行车自从它们在2011年被提供可用.
解答 答案是D.考查被动语态,分析句子可知since引导的从句中主语是they(the bicycles),所以句子要用被动语态,时间状语是2011年,所以要用过去时,故答案是D.
点评 被动语态由"助动词be+及物动词的过去分词"构成.被动语态的时态变化只改变be的形式,过去分词部分不变.疑问式和否定式的变化也如此.掌握各种时态的被动语态是解题的关键.
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