单项选择题
The Olympic games ______ in 776 B.C. in Olympia, a small town in Greece.
单项选择题 Careful surveys have indicated that as many as 50 percent of patients do not take drugs ______ directed.
单项选择题 The law requires that everyone ______ his car checked at least once a year.
单项选择题 It ______ months since we ______ in Shanghai.