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题型：单选题题类：常考题难易度：普通

江苏省徐州市2020届高三上学期英语期中考试试卷

LED lighting, even in most developed countries, ________ long enough to know its effects across the human lifespan.

A、has not been used B、was not used C、had not been used D、is not being used

举一反三

In the 1950s in the USA, most families had just one phone at home, and wireless phones _______ yet.

When the government is going to end the existence of a custom or a law，we say it is to be {#blank#}1{#/blank#}(废除)．

There research center has {#blank#}1{#/blank#}(成功) in developing a new anti-virus medicine.

He had a bad cold, because he was {#blank#}1{#/blank#} (catch) in the heavy rain on his way home after school.

Many a new house {#blank#}1{#/blank#} (build) at present in the disaster area.

Mount Huang was{#blank#}1{#/blank#}(挤满)with visitors from home and abroad during the National Day.

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