China speed is amazing the world. While other countries are struggling to make high-speed railway a reality, the China Railway Corporation ______ (busy) itself in laying down over 25,000 km of high-speed tracks over the past ten years —— accounting for roughly two thirds of the world's total length of high-speed rail lines.
这道题是语法填空的一个长难句解析。句首的 while 作连词，连接两个句子，表示轻微的对比和转折，意为 “其他国家在……，而中国在……”。因此含有划线部分的简单句应为 the CRC _______ (busy) itself in doing sth，这样判断一下，横线处就需要填一个谓语动词。busy 的常用词性为形容词，意为繁忙的，常用于短语 be busy with sth / be busy (in) doing sth 中表示忙于做某事。
此处就活用成动词，用于短语 busy oneself (in) doing sth，表示使自己忙于做某事。再结合一下本句中的时间状语 over the past ten years，此处选用现在完成时或现在完成进行时。China speed is amazing the world. While other countries are struggling to make high-speed railway a reality, the China Railway Corporation has busied / has been busying itself in laying down over 25,000 km of high-speed tracks over the past ten years —— accounting for roughly two thirds of the world's total length of high-speed rail lines.
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