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Bob ________ with us together since he came to our school.
A.have workedB.has workedC.workedD.will work
B

试题分析:考查时态。本题的关键在于since(自从);该连词一直都是与现在完成时连用的,表示从过去的某个时间开始到现在,所发生的事情。句意:自从他来到我们学校到现在,Bob一直都很我们在一起学习。故B正确。
点评:时态题的考查关键是抓住句子的上下文含义和句中的时间状语。要根据时间状语来选择合适的时态,在平时的学习中要注意积累有关时态的用法和各种时态的特殊之处。如since, so far等经常与现在完成时连用。在条件状语从句中用一般现在时代替将来时等等。
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