单选题 The company is pleased to announce that we have invited several members of our experienced ______ and casual staff to become permanent employees.

【正确答案】 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)。