Experts have been warning___of the health risks caused by passive smoking.
A．a(chǎn)t a timeB．a(chǎn)t one time
C．for some timeD．for the time
C
for some time 意為“一段時間”，因?yàn)橹^語用了現(xiàn)在完成進(jìn)行時，所以要用for some time，表示從過去的某個時候開始一直延續(xù)到現(xiàn)在的一段時間內(nèi)，專家一直警告說被動吸煙引起健康危急。at a time意為“每次,在某時”；at one time意為“同時,曾經(jīng)”；for the time意為“暫時”。
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