题目内容

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．dismissedC．dismissingD．having dismissed.
B
本题考查动词时态。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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