Question

—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

Answer 1

B

解析試題分析：句意：--大衛還沒有完成作業嗎?—我想沒有完成吧，他在午飯時間還在工作，你想要我證實一下嗎?根據I guess not. He       on it at lunchtime可知他在午飯的時間正在做，故用過去進行時。故選B。
考點：考查動詞時態。