【題目】All his attention ________ on the movie, so he didn't even notice the boss enter the room.
A.has been fixed
B.fixing
C.was fixed
D.fixed

【答案】C
【解析】考查時態(tài)和語態(tài)。句意：他所有的注意力都集中在電影上，所以甚至沒有注意到老板進了房間。主語attention和動詞fix是被動關系，與后句didn't時態(tài)一致，也用過去時。故選C。

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