Using a proper modal auxiliary: I’m sure that he is working late at the office.

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问题 Using a proper modal auxiliary:
I’m sure that he is working late at the office.

选项

答案He must be working late at the office.

解析 译文:我确定他正在办公室工作。sure表示确定的、确信的,含有一种肯定的语气,因此本句可用表示肯定猜测的must。
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