My friend has returned from the UK. She ______ at Oxford for four years, during which we municated with each other on the Internet.A.studiedB.has studiedC.had studiedD.has been studying
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A解析试题分析：句意:我的朋友从英国回来了，她在牛津大学上了四年，在那期间我们彼此在网上交流。根据has returned可知朋友已经不在英国，是过去曾经在英国，所以应该用过去式，故选A。考点：考查动词时态的用法。点评：本题难度适中。动词时态是高中阶段的重难点之一，高中要求掌握的时态需要考生牢记它们的用法，但是时态必须要结合一定的语境才能做出正确的判断。这里考生容易误选C。即学即练: Experiments of this kind in both the U.S. and Europe well before the Second World War.A. have conducted B. have been conducted C. had conducted D. had been conducted解析：D。句意：就在二战爆发前，美国和欧洲都进行过这种实验。”首先考虑语态，主语experiment与conduct构成动宾关系，谓语使用被动形式。题干中出现the second war是过去的时间点，before the second war是过去的过去，因此使用过去完成时。选D。