---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

C


解析:

此題第二空根據(jù)spend …(in) doing sth.結(jié)構(gòu)應(yīng)選preparing；第一空根據(jù)主語she與lock是被動關(guān)系，用過去分詞作伴隨狀語。

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