"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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