While a full understanding of what causes the disease may be several years away, ______. leading to a successful treatment could

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问题 While a full understanding of what causes the disease may be several years away, ______. leading to a successful treatment could come much sooner.

选项 A、a distinction
B、a breakthrough
C、an identification
D、an interpretation

答案B

解析 breakthrough突破性进展,重大发现。distinction区别,差别;特征;身份证明。interpretation解释,说明;诠释。
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