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We were told that we should follow the main road ________ we

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We were told that we should follow the main road ________ we reached the central railway station.
A.whenever
B.until
C.while
D.wherever
答案B
根据follow的含义可知后面的空格处应该是能和表示延续动词搭配的连词,而whenever“无论何时”,while“当什么时候”,wherever“无论何地”,都不合题意,故选择B项.