We students should treasure the short senior school’s study life of three years. Once ________, the opportunity can’t get back.
A．losingB．was lostC．lostD．being lost
C

試題分析：考查狀語從句的省略：句意：我們每個(gè)學(xué)生應(yīng)該珍惜短暫的三年高中學(xué)習(xí)生活，一旦失去了，機(jī)會(huì)不再來。Once引導(dǎo)的是條件狀語從句，是省略句，完整的是once the short senior school’s study life is lost，主從句主語一致的時(shí)候，主語和be動(dòng)詞可以省略，選C。
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