While a full understanding of what causes the disease may be several years away, ______ leading to a successful treatment could come much sooner. "A. a distinction B. a breakthrough C. an identification D. an interpretation "

While a full understanding of what causes the disease may be several years away, ______ leading to a successful treatment could come much sooner. "A. a distinction B. a breakthrough
C. an identification D. an interpretation
"

出自：西安交通大学--英语三

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