Question

______ returning home, she found a note _________ to the door, reading: “Call in later.”

A．On; attaching

B．On; attached

C．At; attaching

D．At; attached

Answer 1

B

本题考查介词和非谓语动词。便条note是被粘贴在门上的，所以用过去分词表示被动。On doing sth表示一……就……。