Mary must have received my mail; otherwise she would have replied before now.A、M

游客2023-12-25 10

问题 Mary must have received my mail; otherwise she would have replied before now.

选项 A、Mary should
B、Mary ought to
C、Mary shouldn’t
D、Mary couldn’t

答案 D

解析本题考查情态动词。句意为：玛丽肯定没有收到我的邮件，否则，到现在应该已经回复了。根据句意可排除A、B两项；此处是表示对否定句的肯定推测，用couldn’t。shouldn’t表示不应该。所以，答案为D。

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