The two friends _____ on the Internet for three hours, and they would go on till the next morning.
A．had been chattingB．had chattedC．were chattingD．has been chatting
A
句意：這兩個朋友已經(jīng)上網(wǎng)聊天3個小時了，而且還將繼續(xù)到第二天早上。這個過去的過去一直在進(jìn)行并且將延續(xù)到動作當(dāng)然應(yīng)該用過去完成進(jìn)行時來表達(dá)。
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