The experts present at the conference all insisted that greenhouse gas emission        be reduced from now on．  
A．mustB．will C．/D．can
C

試題分析：句意：出席會(huì)議的專家都堅(jiān)持溫室氣體排放從現(xiàn)在起要減少。動(dòng)詞insist做為“堅(jiān)持要求”的時(shí)候，后面的賓語從句，用虛擬語氣，謂語是should do，should可以省略，所以選C。
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