Experts have been warning ___ of the health risks caused by passive smoking.

A.at a time                                                      B.at one time

C.for some time                                               D.for the time

C


解析:

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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