what onearth caused the evening party to be put off? ___ the invitations.

问题描述:

what onearth caused the evening party to be put off? ___ the invitations.
A TOM delayed sending B TOM'S delaying sending
C TOM delaying to sendD TOM delayed to send

选择B,tom和delay是主动关系,所以用ing,而delay后面的动词跟ing,