Her grandparents are still in good health they are over eighty.
A. though
B. as soon as
C. until
D. because
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(答案→)A. though
B. as soon as
C. until
D. because
解析：考查连词。Though虽然,尽管; as soon as一……就； until直到； because因为；句意：尽管他们超过了八十岁，但是她的爷爷奶奶仍旧很健康。故选A。