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    精英家教网 > 高中英语 > 题目详情
    Since the project has been ___ on well, you must ___ it on until it is completed.
    A．carrying, carry B．going, carry
    C．going, goD．carrying, go
    B

    试题分析：原句意思是，这项工程进展顺利，你一定要坚持，直到它完工。表示动作从过去某一时间开始一直延续到现在，并且有可能持续下去，所以应该用现在完成进行时；carry on意思是继续，坚持下去，所以选B。
    点评：根据前后句的关系，来判断时态。表示动作从过去某一时间开始一直延续到现在，并且有可能持续下去，应该用现在完成进行时
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