How did birds evolve from theropod dinosaurs? Paleontologist Xing Xu believes the transition is evident in the fossil record. In a 2014 paper, Xu and his team ______ the discovery of a dinosaur species with asymmetric feathers, a key feature previously thought to be unique to birds.
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readingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
described
B
describing
C
having described
D
to describe
Correct Answer: A
Choice A is the best answer. The sentence refers to a specific past event ("In a 2014 paper..."). The simple past tense "described" is required to indicate a completed action.