To be happy-go-lucky is to be cheerful about almost everything and forget about the stresses and pressures of everyday life. A．pessimistic B．upset C．light-hearted D．courteous
A. A．pessimistic B．upset C．light-hearted D．courteous
【参考答案】
C 该句意为：无忧无虑就是遇到什么事都积极乐观，把日常生活中的种种烦恼抛在脑后。happy-go-lucky是个......