They were shocked to hear that their son had been arrested for taking drugs.
问题描述：
They were shocked to hear that their son had been arrested for taking drugs.
答
当他们听到他们的儿子因为吸毒而被捕时，他们震惊了
答
当他们听说他们的儿子因吸毒而被捕的消息后，他们惊呆了
答
当他们听闻自己的儿子已因吸毒而被捕时感到十分惊骇。
答
他们很震惊地听到儿子由于携毒被捕
答
他们很吃惊地听说他们的儿子因为吸毒已经被捕
答
他们很吃惊地听说他们的儿子已经被捕,在吸毒。