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I ___________ to phone her all day, but whenver I phone her, the line is engaged.
A.triedB.had been tryingC.have triedD.have been trying
D

试题分析:从the line is engaged可得知与现在有关,排除AB,再从时间状语all day可知动作从过去开始一直持续到现在还很有可能持续下去,故使用现在完成进行时。句意:我一整天都在打她的电话,但是无论我什么时候打,电话都占线。
点评:要善于确定句子时态,可以通过时间状语确定,还可以根据上下文来确定.但不能断章取义,要认真看清题意。
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