题干
--- The Internet has become not only a necessary but also a virtual (虚拟的) world for teenagers.
--- Yes, teenagers should learn to _______ invitations from net friends and can’t go to meet them alone.
--- Yes, teenagers should learn to _______ invitations from net friends and can’t go to meet them alone.
| A．pull down | B．write down | C．turn down | D．close down |
答案(点此获取答案解析）
