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13. Some astronomers have concluded ________ from outer space, such as the meteor, may have traveled through the vast universe for thousands of years.
(A) that flying objects are
(B) flying objects that
(C) that flying objects
(D) objects are flying

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10
 【站僕】摩檸Morning：有沒有達人來解釋一下?
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13. Some astronomers have concluded ____..-阿摩線上測驗