公共英语二级

单选题 —Has Tom finished his experiment today?
—No idea．He__________it this morning．

A．is doing
B．Was doing
C．had done
D．has done

参考答案：B进入在线模考
句意：——汤姆今天完成实验了吗?——不知道，他今天上午一直在做。本题考查的是时态的用法。根据题意，题目表达的是Tom今天上午一直在做，需用过去进行时，故B正确。
【知识拓展】过去进行时表示过去某段时间内持续进行的动作或者事情。常用的时间状语有this mornin9，the whole mom-ing，all day yesterday，from nine to ten last evenin9，when，while等。
e．g．：I was reading when he entered．当他进来的时候我正在看书。

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