Question

Henry can’t attend the party ________ at Tom’s house at present because he is preparing the speech at the party ________ at Marie’s house tomorrow.

A．being held; to be held　

B．to be held; to be held

C．to be held; held

D．held; being held

Answer 1

 A　现在分词的被动语态作后置定语表示动作正在进行，相当于定语从句which is being held；不定式一般式的被动语态表示将要发生的动作。根据句意，可知答案为A。