摘要： According to the report, this virus was never known, which had claimed countless lives, it was accidentally found by a doctor. A. unless B. since C. so that D. until
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According to the report, this virus was never known, which had claimed countless lives, _____ it was
accidentally found by a doctor.
accidentally found by a doctor.
[ ]
A. unless
B. since
C. so that
D. until
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B. since
C. so that
D. until