题目内容
从所给的四个选项中选择最佳答案
I ________ to be out when he dropped in.
[ ]
A.happened B.happen C.took place D.came upon
答案:A
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题目内容
从所给的四个选项中选择最佳答案
I ________ to be out when he dropped in.
[ ]
A.happened B.happen C.took place D.came upon