单项选择题


A．developed
B．changed
C．occurred
D．continued
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单项选择题
A．clearerB．moreC．possibleD．rare
A．clearer
B．more
C．possible
D．rare
单项选择题
A．In the endB．ThereforeC．After allD．however
A．In the end
B．Therefore
C．After all
D．however
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