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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