[ Grammar ]
While many spiders use webs to catch their food, others capture prey using hunting or burrowing techniques. Spiders from the family Ctenizidae, often called trapdoor spiders, ______ their burrows with doors, using their silk for hinges.
Which choice completes the text so that it conforms to the conventions of Standard English?
A. cover
B. are covering
C. will have covered
D. had covered

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