She was leaning against a tree as if for someone.
A. waited
B. wait
C. to wait
D. waiting
网友回答
A. waited
B. wait
C. to wait
(答案→)D. waiting
解析：考查状语从句的省略。当状语从句的主语和主句主语一致，并且含有系动词be时，可以把状语从句的主语和be动词省略。本句补充完整应是She was leaning against a tree as if she was waiting for someone.所以选D。