For some time the expert __________ people of the health risks caused by passive smoking. He     says he won’t stop until all the smokers around him decide to quit smoking.
A．is warnedB．is warningC．has been warningD．has been warned
C
考查時態(tài)：句意是：有一段時間這個專家一直在警告被動吸煙引起的健康危害，他說知道身邊所有的抽煙者都戒煙了他才停止。由此可知警告這個動作是從過去到現(xiàn)在一直在做，而且還要繼續(xù)，符合現(xiàn)在完成進行時的用法。選C。
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