单项选择题


A．It estimates
B．It is estimated
C．It confirms
D．It is confirmed
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单项选择题
A．as well asB．in additionC．as a resultD．in sum
A．as well as
B．in addition
C．as a result
D．in sum
单项选择题
A．mustB．mightC．shouldD．ought to
A．must
B．might
C．should
D．ought to
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