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单选题
How many more decades will have to pass ______ scientists succeed in providing a cure for cancer?
A
when
B
before
C
since
D
until
参考答案
参考解析
解析：
句意：还要多少年科学家能成功提供治疗癌症的方法？before在…之前。其他选项都不符合题意。
句意：还要多少年科学家能成功提供治疗癌症的方法？before在…之前。其他选项都不符合题意。
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