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(   ) 3. It          a long time since we reached Beijing.

A. is          B. was

C. has been    D. had been

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阅读短文,从方框中选择适当的词并用其正确形二式填空,使短文通顺、意思完整。 

for, care, read, always, at, allow, word, develop, protect, they,   

interesting, never

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根据材料内容选择最佳答案。

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A. Galaxies.

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