Question

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

求解析

Answer 1

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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