【单选题】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
【单选题】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
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