Doing morning exercises is certainly good for the old man, but it remains ________ whether he will enjoy it．A.to seeB.to be seenC.seeingD.seen
网友回答
B解析本小题考查连系动词remain的用法, 其表语表示将来的动作时，要跟动词的不定式形式，意为“仍然要”．句中it是形式主语，而真正的主语是whether he will enjoy it．see与主语是被动关系，所以要用不定式的被动语态．类似的用法还有：Much work remains to be done．