第18题: [单项选择]The company is pleased to announce that we have invited several members of our experienced ______ and casual staff to become permanent employees. A. minor B. lengthy C. temporary D. duplicate 参考答案:C 答案解析:并列连词and一般用于列举相同词性的词汇,因此应选择和casual(非正规的)意思相近的形容词。答案是(C)temporary(临时的)。