中文谷Thetwofriends
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問題詳情：
The two friends ______ on line for three hours, and they will go on.
A. had been chatting B. had chatted C. were chatting D. have been chatting
【回答】
B
知識點：過去完成時及其被動式
題型：選擇題
標籤：
Thetwofriends
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