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The __________ to the rocket going into space went wrong, and as a result it exploded and fell into the sea.

A.mark B.sign C.symbol D.signal 

D

解析试题分析:A.mark记号,B.sign迹象,标志,C.symbol象征,D.signal信号,句意:进入太空的火箭信号出了问题,因此它爆炸了掉入海里。根据句意选D。
考点:考查名词辨析

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