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题目内容
（延安大学大学英语3(专升本)）
5. (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
A、 lose
B、 lost
C、 cost
D、 last
参考答案
