Experts have been warning _____ of the health risks caused by passive smoking.
A.a(chǎn)t a timeB.a(chǎn)t one timeC.for some timeD.for the time
C
for some time 意為“一段時(shí)間”,因?yàn)橹^語(yǔ)用了現(xiàn)在完成進(jìn)行時(shí),所以要用for some time,表示從過(guò)去的某個(gè)時(shí)候開(kāi)始一直延續(xù)到現(xiàn)在的一段時(shí)間內(nèi),專家一直警告說(shuō)被動(dòng)吸煙引起健康危急。at a time意為“每次,在某時(shí)”;at one time意為“同時(shí),曾經(jīng)”;for the time意為“暫時(shí)”。
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