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(dòng)詞時(shí)態(tài)。根據(jù)主句動(dòng)詞allowed為一般過去時(shí)態(tài)，and后的動(dòng)作是順成關(guān)系，故也用一般過去時(shí)。選B。
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