题目内容
17．---It's 12April today．Have they found any useful information about the plane's black box？---Flight MH370？Yes，but it's difficult to decide where the black box really is．（ ）
| A． | still | B． | ever | C． | yet | D． | never |
分析 ---今天是4月12日，他们曾找到一些关于飞机黑匣子的有用信息了吗？---马航MH370？是的，但是很难决定那个黑匣子到底在哪？
解答 答案：B．ever 用于完成时表示曾经．A．still仍然，还； B．ever 曾经； C．yet还，也；用于否定句； D．never不曾；根据Have they found 可知问句是完成时，故用ever，是完成时的标志词，表曾经，故选B．
点评 本题考查副词的用法．区分好用法，可作出正确的答案．
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