The two friends _____ on the Internet for three hours, and they would go on till the next morning.
| A．had been chatting | B．had chatted | C．were chatting | D．has been chatting |
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The two friends _____ on the Internet for three hours, and they would go on till the next morning.
| A．had been chatting | B．had chatted | C．were chatting | D．has been chatting |
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