英语找错：找出句子中哪个括号中的内容是错误的，并且加以改正，说明?
(When) ison died, it was proposed (that )the American people (turned off )all power in their homes, streets and factories for several minutes (in honor of )this great man. 只有一个括号中的内容是错误的。
turned off .正确的短语是：turn off 这道题考察虚拟语气的相关知识，原来的句子应该是：it was proposed that the American people should turn off ....... propose 这个词要求接从句时使用虚拟语气，形式是：should do ,should 可以省略。和propose 这个词类似的词语还有，suggest , order, insist, 等。