Maria wear a dress at the party yesterday.
A. is supposed
B. is supposed to
C. was supposed to
D. should to
网友回答
A. is supposed
B. is supposed to
(答案→)C. was supposed to
D. should to
解析：根据yesterday可知，本句是过去时，故排除AB；根据should后面跟原形，故排除D。本句的意思是”玛利亚在昨天的晚会上应该穿裙子。”所以本题选C。