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— How much are the two pairs of trousers?
— They are not expensive. I think one hundred dollars ______ enough.
A.isB.areC.wereD.was
A

试题分析:句意:这两条裤子多少钱?——他们不贵。我认为100美元就足够了。结合语境可知下文描述的是客观性动作,故用一般现在时态,主语one hundred dollars表示抽象含义,故谓语动词用单数。
点评:英语中的时态主要是借助于时间状语与上下文语境来进行判断。解答此类题型,首先要注意句子中的时间状语,如果没有则要通过分析上下文,结合语境来判断句子的时态。英语中的现在进行时态和现在完成时态中的助动词,往往因为主语的不同,而有所不同,需要注意与主语保持一致。
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