题目内容：

She didn't hear the phone.She ___ asleep.A may be B must be C should have been D must have been

优质解答

答案：D
翻译：她没有听到电话声,她一定是睡着了.
解析：第一句话讲她没听到,用过去时.后一句话对其解释,用must+完成时态的结构,表示对过去事情的猜测.


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