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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統計: A(56), B(5), C(76), D(3), E(0) #586886
統計: A(56), B(5), C(76), D(3), E(0) #586886