Peter said he was sorry he___the key A losing B had lost C loses D lose
问题描述：
Peter said he was sorry he___the key A losing B had lost C loses D lose
要说理由哦
答
B..LOST
A是losing 是进行时
C loses是一般现在 第三人称单数+s 但是这件事是发生在过去的.已经丢了 所以选择D Had lost 是完成时
B lose的过去式应该是LOST