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题型：单选题题类：模拟题难易度：普通

Look! What a clean room! Who_______ it?

A、has tidied B、is tidying C、will tidy D、tidied

举一反三

There life on earth for many years.

Where did Mary go last month?

I ______ hard to improve my skills in the past three years.

Wu Wei, the young artist, has {#blank#}1{#/blank#}(给……留下印象)the whole country with his create work.

—______________ you ______________ breakfast yet?

—Yes，I have.

Many foreigners could not believe their eyes. China has ____ so quickly.

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