题目：
George Ernest Morrison, an Australian, traveled the "five-foot roads," or foot paths, from Shanghai to Rangoon in 1894, ______ China before it was engulfed in a century of revolution, war and political tumult.
A．witness
B．witnessed
C．witnessing
D．to witness
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
