He was known to thrash his wife occasionally when he was drunk.

单项选择题The utilization of hydroelectric resources should be stepped up.

单项选择题A. It is impossible to lock oneself for a week without anything to eat. B. The man should have a rest as soon as possible. C. It’s unthinkable that such work can be accomplished with so great efficiency. D. His thesis is too short to fulfill the school requirement.