---What’s the matter? You look worried and restless.---Oh, nothing really serious. As a matter of fact, I ______ of my graduation thesis. I have to hand it in soon.A.am just thinkingB.just thoughtC.have just thoughtD.was just thinking
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D解析考查动词的时态与语态。从会话可知，答话人是在解释他look worried and restless 的原因，因为他（刚才）是在思考毕业论文的事，这是说话前的那个时刻正在发生的事情。故应用过去进行时描写正在进行的动作。