单项选择题


A．However
B．Thus
C．Nevertheless
D．Consequently
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单项选择题
A．formerB．onceC．latterD．later
A．former
B．once
C．latter
D．later
单项选择题
Many deaths during childbirth could be prevented by the following methods EXCEPT ______.
A．by passing virus to the babies
B．by using medicines
C．by improving health condition
D．by vaccine inoculation
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