My pain ______ obvious the moment I walked into the room, for the first man I met asked me pitifully, "Are you feeling all right

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问题 My pain ______ obvious the moment I walked into the room, for the first man I met asked me pitifully, "Are you feeling all right?"

选项 A、must be
B、could be
C、must have been
D、could have been

答案C

解析 must have done表示对过去发生事情的肯定猜测,意为“肯定……;一定”。
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