题目内容
6.Global oil prices____ since June as demand weakens in China and Europe while output in the United States grows steadily.( )| A. | fell | B. | had fallen | ||
| C. | were falling | D. | have been falling |
分析 自六月以来,因为中国和欧洲的原油需求减弱,全球的石油价格一直在下降,然而美国的产量却稳步增长.
解答 答案D.
根据时间状语since June可知,本题的时态为现在完成时,根据句意:从六月开始国际油价开始下降,一直持续到现在,还可能会一直进行下去,因此本题应使用现在完成进行时,故选D.
选项A是一般过去时,表示过去某个时间点发生的动作;选项B为过去完成时,表示过去的过去;选项C是过去进行时,表示过去某段时间正在发生的动作.故排除选项A、B、C三项.
点评 本题考查现在完成进行时.现在完成进行时表示从过去某个时间点开始的动作,一直持续到现在,还可能会一直进行下去.现在完成进行时的结构为:主语+has/have+been doing+…常用的时间状语有:since+时间点,for+时间段,以及already,never,ever,before,just等副词.本题的since June即是现在完成进行时的标志词.
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