题目内容：
Paul had to write a history paper, ______ he couldn't find time to do it.
[ ]
A. but B. so
C. became
D. if
参考答案：
单选题：Paul had to write a history paper, ______ he couldn't find ..
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- 题目类型：单选题
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B. so
C. became
D. if
B. so
C. became
D. if
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