题目内容
（请给出正确答案）
[单选题]
Why are some cancers cured by chemotherapy alone, whereas others are unaffected by drug
A.while
B.where
C.when
D.however
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.while
B.where
C.when
D.however
如果结果不匹配，请 联系老师 获取答案
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