单项选择题

The doctor tried to do an experiment to find out the（）of the medicine on the mice.

A．cause
B．result
C．reason
D．effect

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B．Breastfeeding May Lower Moms’ Diabetes Risk
C．Breastfeeding May Become Very Fashioaable in Near Future
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（） ten minutes earlier, you wouldn’t have missed the tr...

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A．Had you come
B．Did you come
C．Have you come
D．Should you come