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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．dismissedC．dismissingD．having dismissed.
B
本題考查動詞時態(tài)。根據(jù)主句動詞allowed為一般過去時態(tài)，and后的動作是順成關(guān)系，故也用一般過去時。選B。
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