______ without friends ______ the most difficult challenge for Chuck while living on the island.
A．How to survive, isB．How does he survive, are
C．How does he survive, isD．How to survive, are
A

試題分析：考查主謂一致。句意：當庫克住在島上的時候沒有朋友怎樣生存對他來說是最難的挑戰(zhàn)。排除B和D，是因為無論是動詞不定式還是從句做主語時謂語動詞都用單數(shù)，，C不對是因為C語序不對，因為從句做主語時是陳述語序，所以A是動詞不定式做主語謂語動詞用單數(shù)，所以A正確。
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