选D其实就是靠动词状态的相互切换.
首先在Our clavichord is kept in the living room 这句话里面,主语是钢琴,钢琴被放在起居室里,这里的keep当然要用被动语态be kept.而后面那句话主语变成了“we”,我们把钢琴放在了起居室,是一般语态,所以要用一般现在时keep.
切记,动词始终只对主语负责,主语是什么状态,动词就是什么状态.
这题可切换成一下：
1：Our clavichord is kept in the living room .（我们的钢琴被放在起居室里.主语“钢琴”处于被动式,故动词使用keep的被动语态be kept.）
2：we keep our clavichord in the livingroom.（我们把钢琴放在起居室里.主语“我们”为主动语态,故使用一般现在时keep）
and as you know,the whole question is a bloody clause,and the "that" in the sentense means "livingroom",that's why I tranform the sentense into those two that have been shown.
现在就清晰的多了吧?