问题
选择题
The number of women dying from breast cancer has fallen to its lowest level ____ records began in 1971.
A．when
B．before
C．since
D．after
答案
答案：C
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The number of women dying from breast cancer has fallen to its lowest level ____ records began in 1971.
A．when
B．before
C．since
D．after
答案：C