_____ teens are using the Internet for both social and intellectual development, they are also facing significant challenges on how to manage their relationships online.
| A．Unless | B．While | C．Once | D．Until |
更新时间：2019-12-31 13:50:05
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【推荐1】_______ difficult and challenging the task may be, we must finish it on time, because there is a possibility _______our work will go down in history.
| A．Whatever; that | B．However; as |
| C．Whatever; which | D．However; that |
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【推荐2】_____you may not be the next Bill Gates, for example, by learning from people like him you may become just as, if not more famous, because of your success.
| A．If | B．While | C．Since | D．As |
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