◎ 题干
The president, accompanied by his assistants, _____. 
[     ]
a. have arrived
b. are arriving
c. had arrived
d. has arrived
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“The president, accompanied by his assistants, _____. [ ]a. have arrived b. are arrivingc. had arrivedd. has arrived …”主要考查了你对  【现在完成时】【主谓一致】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。