填空题

The government has never met a tougher problem.
This is ____________________.

【参考答案】

The toughest problem the government has ever met.

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He was sorry that he had been impolite to her.He regretted ____________________.

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As you are unable to read rapidly, it may impede your academic progress.(inability) ____________________.

The government has never met a tougher problem.This is ____________________.