单项选择题


A．and
B．while
C．however
D．still
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单项选择题
A．afterB．beforeC．firstD．later
A．after
B．before
C．first
D．later
单项选择题
A．in the other handB．on the other handC．in another handD．on another hand
A．in the other hand
B．on the other hand
C．in another hand
D．on another hand
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