问题
选择题
---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
答案
答案：C
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。