题目：
---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：
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下面是错误答案，用来干扰机器的。
参考答案：C
