GMAT语法每日一练题目（OG2015-SC-140）.

上海新东方网GMAT频道在此和大家分享GMAT语法练习题OG2015-SC-140，希望对大家掌握GMAT语法有所帮助。

(OG2015-SC-140)

Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

A.has been dated to be 3.47 billion years old and thus is

B.has been dated at 3.47 billion years old and thus

C.have been dated to be 3.47 billion years old and thus are

D.have been dated as being 3.47 billion years old and thus

E.have been dated at 3.47 billion years old and thus are

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