问答题

The manager（）(本可以亲自参加会议), but he was called away for some urgent business abroad.

【参考答案】

could have attended the meeting in person/by himself

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问答题

The theory he advanced has proved （）(对许多传统概念的一种挑战).

填空题

Carrying on a mobile phone conversation while one is driving is considered dangerous because it seriously distracts （）.