单项选择题


A．for
B．in
C．at
D．to
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单项选择题
A．HoweverB．In contrastC．On the contraryD．Thence
A．However
B．In contrast
C．On the contrary
D．Thence
单项选择题
A．At firstB．In the beginningC．At first handD．In the first place
A．At first
B．In the beginning
C．At first hand
D．In the first place
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