We don’t know how important something is _______ we lose it.

A. or B. until C. as soon as D. after

B 【解析】句意：我們不知道什么東西有多重要，直到失去它。考查固定搭配。A. or或者；B. until直到；C. as soon as一…就…；D. after在…之后。根據(jù)句意結(jié)合關(guān)鍵詞don’t ，可知判斷出此句應(yīng)用固定表達(dá)“not…until” 來完成，意為“直到…才”引導(dǎo)一個(gè)時(shí)間狀語從句，故答案選B。
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