Question

求解一道题，2017南通一模的，答案为啥选

______ to the gift was a note on which he expressed his appreciation for our reception during his stay here.
A. Being attached
B. Attached
C. Attaching
D. Having attached
答案为啥不选A选B

Answer 1

Being attached to the gift was a note on which he expressed his appreciation for our reception during his stay here.

这是个倒装句，原来语序为；
a note was being attached to the gift 【on which he expressed his appreciation for our reception during his stay here】.定语从句不用看；
用被动进行表示同时关系，用Attached 可能表示a note并没有当时看。

Answer 2

B。倒装句
正常语序为：A note on wich he expressed his appreciation for our reception during his stay here was attachef to the gift.