A major search has been_____ for a Malaysian Airlines jet with 239 people on board after it lost contact flying from Kuala Lumpur to Beijing.
A．identifiedB．launchedC．substitutedD．dissolved
B

試題分析：考查動(dòng)詞。A. identified識(shí)別；B. launched開展（活動(dòng)、計(jì)劃等）；C. substituted替換；D. dissolved使消失。句意：在馬來西亞航空公司一架載有239人的飛機(jī)從吉隆坡飛往北京失去聯(lián)系之后，一場(chǎng)大型搜索已經(jīng)展開。故B正確。
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