

MCQOPTIONS
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1. |
Several studies have been conducted to link smoking with cancer, but |
A. | none has been able to explain why some people who are regular smokers have never contracted cancer while some others who never smoked do. |
B. | none have been able to explain why some people who are regularly smoking have never contracted cancer while some other who never smoked have. |
C. | none has been able to explain why some people who are regular smokers have never contacted cancer while some other who never smoked have. |
D. | none have been able to explain why some people who are regular smokers have never contracted cancer while some others who never smoked have. |
Answer» E. | |