题目内容：
20. 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
参考答案：
选择题：20. His father was ______ in thought and did not h
- 题目分类：长春工程学院-大学英语3(专升本)
- 题目类型：选择题
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A、 lose
B、 lost
C、 cost
D、 last