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Our English teacher , having explained to us how to design a project, allowed us  a whole week’s preparation and then ______the class.
A.to dismissB.dismissed
C.dismissingD.having dismissed
B

试题分析:考查动词时态。句意:我们音乐老师,和我们解释了怎么设计一个项目后,允许我们一周的准备时间,然后下课了。根据主句动词allowed为一般过去时态,and后的动作是顺成关系,故也用一般过去时。选B。
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