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Verbal·Standard English Conventions·Boundaries
medium
On April 12, 1981, the space shuttle Discovery blasted off into space, completing Mission        caused the shuttle to land at Kennedy Space Center in Florida.
Which choice completes the text so that it conforms to the conventions of Standard English?
A
STS-1. It heated
B
STS-1. Its heating
C
STS-1. It heating
D
STS-1.0. Heating