单选题 Part timers as well as full timers are encouraged to meet and discuss the details of the proposed plan necessary.
A. meanwhile
B. as often as
C. whereas
D. given

【正确答案】 B

【答案解析】高级问题与从语法方面入手相比，本题从词义分析方面入手则能更迅速地解题。as often as necessary意为“视需要随时”。as often as twice a month也是经常出现的词组，意为“一个月两次的频率”。
[高频词语] meanwhile (adv.) 其间 whereas (conj.) 反之 given (prep. ; conj.) 考虑到；(adj.) 已知的