22. ---Chatting online has become_________popular means of communication..
---That’s true. It is especially popular with young.
| A． / ; the | B．a ; the | C．/ ; / | D．a ; / |
相关试题
He was busy writing a story，only _________ once in a while to smoke a cigarette．
| A．to stop | B．stopping |
| C．to have stopped | D．having stopped |
My sister，an inexperienced rider，was found sitting on the bicycle _________ to balance it．
| A．having tried | B．trying |
| C．to try | D．tried |
_________ in the fields on a March afternoon，he could feel the warmth of spring．
| A．To walk | B．Walking |
| C．Walked | D．Having walked |
_________ to reach them on the phone，we sent an email instead．
| A．Fail | B．Failed |
| C．To fail | D．Having failed |
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