He________the blackboard but could not________the words clearly．A.watched，watchedB.looked at，seeC.saw，watchD.look at，see
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B
解析分析：look(看，注视)指用眼睛去看；see(看到)。本题的意思是“他看黑板，但看不清楚(黑板上的)字。”(延伸)read也可以解释为“看”，但其实质的含义是“读”，如：read the book，read the newspaper，但在汉语中往往把读出声音的叫“读”，而不读出声音的叫“看”，上面的read the book，read the newspaper就常讲成“看书”“看报”；“看地图”也要说成read the map，如：Look，there's a foreigner reading a map on the other side of the street．(延伸)look和see的区别就好比listen和hear的区别。(延伸)watch(看，观看)指集中注意力的“看”，所看的对象往往有“移动”的情况，如：watch a game，watch TV(但“看电影”是see a film)，Watch the cars when you cross the street．(过马路时要注意车辆)。watch sb有时有“监视某人，看顾某人”的意思，如：The detective watched the criminal from behind the
window．(监视)The nurse watched the patient throughout the night．