正确答案:B
译文:该国已经发射了3艘无人宇宙飞船,大都是在3月底发射的.
解析:由于句中没有连接词所以不能选作谓语动词的A项,而应该用上独立主格结构.从at the end of last March在3月底,这是已经过去的时间,表示动作已经发生,可以知道应该用上完成式,所以选B.
A.谓语,与主句冲突,一个句子不能用逗号连接两谓语
C.强调正在进行动作
D.表未来动作
2007山东,英语,33题（2007山东,33）The country has already sent up thre
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