.
we had made great progress 为子句
we do sth."with" sth.
c.d.则要改为who help we make great progress,形容him如此选d
选a或b
用逗点,後面整句是用来"形容"him
用with his的话就会变成另外一个句子,
I will never forget him.With his help we had made great progress.
who指him
i will never forget him,with who's help we had made great progress
用whose代名词所有格
选