单选题 "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

【正确答案】 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。 [解题秘籍] can't和can't+动词完成时分别表示对现在和过去事情的推测，语气比较肯定。