高等继续教育 / 基础英语I
正确率:100%
题型描述: 单选题
He ____ taking a little walk when he saw the boy fall into the river.
A.happened to be
B.happened
C.was happening
D.happened to
He ____ taking a little walk when he saw the boy fall into the river.
A.happened to be
B.happened
C.was happening
D.happened to
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