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即时跟踪1 用所给动词的正确形式填空 1．—Where is Mary? —She is still in the lab.She _____________(do) the experiment since this morning. 2．It __________________(rain) for two days.When will it stop？I'm eager to go out. 3．The foreign scientists __________________(work) in our college for eight years and they don't have the intention to leave.
has been doing
has been raining
have been working
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