_____ in the garden for an hour, the girl suddenly realized she had forgot locking her car door.
A.Reading
B.To read
C.Having read
D.To have read
网友回答
C解析read的逻辑主语是句子的主语the girl , 且两者之间为主动关系, 所以用ing形式作状语。又根据for an hour可知，read已持续了一段时间，即read先于realized，故要用ing形式的完成式作状语。