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John kept looking at the pretty girl, wondering whether he_________ her somewhere.
A．sawB．has seenC．seesD．had seen
D

試題分析：句意：約翰一直看著這個(gè)漂亮的女孩，想知道他在什么地方看見過她。從前面的John kept looking at the pretty girl,可知這里是過去的過去的動(dòng)作，用過去完成時(shí)，所以選D。
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