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题型：单选题题类：常考题难易度：普通

北京市中央民族大学附属中学2018届高三上学期英语12月月考试卷

The Ford Company its autonomous minicars on public roads in Arizona, the US, without a safety driver since October, 2017.

A、has been operating B、has operated C、had been operating D、had operated

举一反三

Tom in the library every night over the last three months.

Even though he gives away a piece of his fortune each year, the stock of Berkshire Hathaway, the source of Warren Buffet's wealth, very rapidly.

In order to stop the virus from spreading further, the scientist {#blank#}1{#/blank#} all possible ways to control it in the past few months. (explore)

在过去的几个月里，这位科学家一直在探索所有可能的方法来控制这种病毒进一步扩散。

Rosa _____ this washing machine for more than ten years. She is thinking about buying a new one.

Our headteacher ____for months to make sure that we understand the importance of concentration.

Tom and his wife have been {#blank#}1{#/blank#} (争吵) with each other over where to spend the holiday for a long time.

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