20. (单选题) His father was ______ in thought and did not hear the door open.(本题2.0分) A、 lose B、 lost C、 cost D、 last

20. (单选题) His father was ______ in thought and did not hear the door open.(本题2.0分)
A、 lose
B、 lost
C、 cost
D、 last

出自：河南城建学院-安全工程-大学英语

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