It’s still not clear＿＿＿＿＿the two countries can reach an agreement at the conference．
A．whatB．whichC．whetherD．that
C

試題分析:句意：還不清楚這兩個國家是否能在會議上達成協(xié)議。在此句中it 是形式主語，后面是真正的主語從句，從句不缺少成份，根據(jù)前面not clear判斷后句是不確定的事情，所以答案選C。
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