－Look! There is_____ UFO. Look at its lights. －No, they’re only the lights on ____ plane.
A. a, the B. an, the C. a, / D. the, /
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－Look! There is_____ UFO. Look at its lights. －No, they’re only the lights on ____ plane.
A. a, the B. an, the C. a, / D. the, /
