单项选择题


A．at length
B．to a great extent
C．from his heart
D．by all means
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单项选择题
A．startedB．conductedC．replacedD．proposed
A．started
B．conducted
C．replaced
D．proposed
单项选择题
A．experienceB．witnessC．watchD．undergo
A．experience
B．witness
C．watch
D．undergo
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