---Where has Mary been? I haven't seen her all day?
---Oh,in order not to be disturbed, she spent the whole day in the study, her report.
A. locking;preparing
B. locked; prepared
C. locked; preparing
D. locking; prepared
网友回答
A. locking;preparing
B. locked; prepared
(答案→)C. locked; preparing
D. locking; prepared
解析：此题第二空根据spend …(in) doing sth.结构应选preparing；第一空根据主语she与lock是被动关系，用过去分词作伴随状语。