The government placed _____ on the numbers of foreign cars that could be imported.
A.limitations
B.restraint
C.requirements
D.restrictions
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D解析 restriction(可数名称)限制性规定：It is a club with rigid restrictions on its membership.Limitation局限性，不足之处，不利之处（可数）：1)I know my limitations.(我了解我的不足之处。) 2)Every from of art has its limitations.（每种艺术形式都有其局限性。）