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 |
句意：這兩個(gè)朋友已經(jīng)上網(wǎng)聊天3個(gè)小時(shí)了，而且還將繼續(xù)到第二天早上。這個(gè)過(guò)去的過(guò)去一直在進(jìn)行并且將延續(xù)到動(dòng)作當(dāng)然應(yīng)該用過(guò)去完成進(jìn)行時(shí)來(lái)表達(dá)。
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