摘要：7．某些习惯用语中不用冠词 go to school; at home ; on time ; at last; in fact; on holiday; on duty; at times; after class; at night; by bus; by sea; by air; by land ; go to bed; in time; at first; lose heart; on foot; at work; on show; in trouble; on fire; stay at home; with joy; with difficulty.

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