"The stove is still on.""It ______ on. I had turned it off myself and I checked it twice."

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问题 "The stove is still on.""It ______ on. I had turned it off myself and I checked it twice."

选项 A、can’t be
B、mustn’t be
C、couldn’t have been
D、mustn’t have been

答案A

解析 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。注意：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。

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