【題目】Hey, you ________ at the computer all day. You should really take a break now.

A.have been sittingB.were sitting

C.did sitD.are sitting

【答案】A

【解析】

考查現(xiàn)在完成進行時態(tài)。句意：嘿，你整天都坐在電腦前。你現(xiàn)在真的應該休息一下。結(jié)合句意可知，表示從過去開始一直進行的動作，用現(xiàn)在完成進行時態(tài)，故選A。

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