the pen that my dad bought me last week is very good.
可用 “which” － the pen which my father ...（比较书面化）,此外,可以说 “very good to use", 但口语表达很少如此.
the pen that my dad bought me last week is very good.
可用 “which” － the pen which my father ...（比较书面化）,此外,可以说 “very good to use", 但口语表达很少如此.