—Has David finished his project yet?
—I guess not. He       on it at lunchtime. Do you want me to confirm it?

A．is working B．was working
C．has worked D．had worked

B

解析試題分析：句意：--大衛(wèi)還沒有完成作業(yè)嗎?—我想沒有完成吧，他在午飯時間還在工作，你想要我證實(shí)一下嗎?根據(jù)I guess not. He       on it at lunchtime可知他在午飯的時間正在做，故用過去進(jìn)行時。故選B。
考點(diǎn)：考查動詞時態(tài)。

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