第30题: [单项选择]"The stove is still on." "It ______ on. I had turned it off myself and I checked it twice." [A] can’t be [B] mustn’t be [C] couldn’t have been [D] mustn’t have been 参考答案:A 答案解析:[名师精解] can’t可以用来对现在状态进行肯定的否认,如:I saw him just going out.He can’t be in there now.我看见他刚离开,现在他不可能在里面。<