问题补充：
When I got back home I saw a message pinned to the door “ Sorry you and I will call later. “
A. reading, to miss
B. that was read, missing
C. to read, to miss
D. read, missing
答案：
(答案→)A. reading, to miss
B. that was read, missing
C. to read, to miss
D. read, missing
解析：考查现在分词和不定式的用法：句意：当我回家的时候，我看见别在门上的便条，上面写着：很遗憾错过了你，我会再打电话的。 “reading 与 pinned to the door 一样作message 的后置定语，相当于which read, pinned 和 reading的逻辑主语都是 message，它与pin是被动关系，用—ed 形式，与 read 是主动关系，用—ing 形式，第二空填不定式，因为be sorry to do很遗憾做了…，选A.
