问题
单项选择题
He was（）the preparation of an international conference when I arrived in Beijing.
A.engaged to
B.engaged for
C.engaged on
D.engaged in
答案
参考答案：D
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He was（）the preparation of an international conference when I arrived in Beijing.
A.engaged to
B.engaged for
C.engaged on
D.engaged in
参考答案：D