问题
选择题
I was just about ___ road ___ a ship came to us.
A．traveling on; while
B．to travel on; while
C．traveling by; when
D．to travel by; when
答案
答案：D
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I was just about ___ road ___ a ship came to us.
A．traveling on; while
B．to travel on; while
C．traveling by; when
D．to travel by; when
答案：D