The sign made it plain that we were not to enter that part of the building.
单选题The sign made it plain that we were not to enter that part of the building.
A.clear
B.complete
C.simple
D.ordinary
参考答案:A
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答案解析:这句话的意思是:那个标识牌很明白地说明,我们不能进入大楼的那一部分。画线词plain意为“明确的”;clear意为“明确的”;complete意为“完整的”;simple意为“简单的”;ordinary意为“普通的”。根据题意,答案为A。