Question

Tom thought it was an honor ___________ to speak in the ceremony.

1. A.
   to invite
2. B.
   to be invited
3. C.
   inviting
4. D.
   having invited

Answer 1

B
考查it充当形式主语。It是形式主语，Tom和invite构成被动的关系。to be invited to speak in the ceremony是真正的主语。句意：Tom认为被邀请在庆典上发言是一件光荣的事情。