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

游客2023-12-25  26

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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