—______ will the fog and haze last?
—I’ve no idea. There is no sign of an end.
A．How soon B．How far
C．How long D．How often
C

試題分析：句意：——霧霾天氣將持續(xù)多長時間？——我不知道。沒有結(jié)束的跡象。A. How soon多久，對將要用多長時間提問；B. How far   多遠，對距離提問； C. How long多長時間，對時間段提問；  D. How often多久一次，對頻率提問。根據(jù)動詞last可知此處指的是要持續(xù)多長時間。故選C。
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