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

試題分析：考查動詞時態(tài)。句意：我們音樂老師，和我們解釋了怎么設(shè)計一個項目后，允許我們一周的準備時間，然后下課了。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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