In 1990, California native and researcher Ellen Ochoa left her position as chief of the Intelligent Systems Technology Branch at a NASA research center ______blank the space agency’s astronaut training program.
Which choice completes the text so that it conforms to the conventions of Standard English?
Correct answer: A
Explanation
Choice A is the best answer. The convention being tested is the use of nonfinite verb forms in a sentence. The nonfinite to-infinitive verb "to join" is correctly used to form a subordinate clause that expresses why Ochoa left her position (to join the training program).
Choice B is incorrect because the finite verb "is joining" can’t be used in this way to indicate Ochoa’s action of joining the training program. A conjunction such as "and" would be needed to coordinate "is joining" with the previous finite verb, "left." Choice C is incorrect because the finite verb "joined" can’t be used in this way to indicate Ochoa’s action of joining the training program. A conjunction such as "and" would be needed to coordinate "joined" with the previous finite verb, "left." Choice D is incorrect because the finite verb "joins" can’t be used in this way to indicate Ochoa’s action of joining the training program. A conjunction such as "and" would be needed to coordinate "joins" with the previous finite verb, "left."
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