(单选题) His father was ______ in thought and did not hear the door open.(本题3.5分) A、 lose B、 lost C、 cost D、 last

(单选题) His father was ______ in thought and did not hear the door open.(本题3.5分)
A、 lose
B、 lost
C、 cost
D、 last

出自：延安大学—大学英语3

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