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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】It has been necessary to refer repeatedly to the effects of the two world wars in promoting all kinds of innovation. It should be (62) also that technological innovations have (63) the character of wa...
A.
observed
B.
notified
C.
commented
D.
detected