close延续性动词：be closed
Factories that employ workers to do dangerous work should be closed.
雇佣工人从事危险工作的工厂应该被关闭。
Police kept a close watch on the vagrants .警察严密监视那些流浪者。
We must not run a newspaper behind closed doors .我们不能关门办报。
The evening was closing down tranquilly .暮色正在静悄悄地笼罩下来。
Museums are closed to the public on mondays .博物馆每逢星期一闭馆。
They'll close it up next spring .明年春天，他们就会把它封盖起来的。
在现在完成时中，如果与for，since，how long连用时，谓语动词必须具有延续性。close 的延续性动词是be closed
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