单选题
Thursday, the terrible noise was
substituted
by the grim, steady hum of search and recovery.
A、
replaced
B、
expired
C、
returned
D、
restored
【正确答案】
A
【答案解析】
replace：取代；expire：终止，满期；return：归还，回复；restore：复职，复兴。题中substitute；意为“取代”，故答案为A。
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