你好~
due to在朗文字典是歸屬於介系詞
https://www.ldoceonline.com/dictionary/due-to
網址如上，
例句：
She has been absent from work due to illness.
The restaurant’s success was due largely to its new manager.
所以，事實上你說的用法與書上的用法都是可以的。
另外表介系詞的片語，相似的有：
because of , as a result of , owing to, by virtue of等等。
提供你參考。
※ 引述《deron3 (無敵鐵金剛明)》之銘言：
: 130. This season’s sales have expanded (due to) the newly appointed marketing
: manager’s ingenious advertising strategies.
: 136. This warranty does not apply to any problems the customers may encounter
: (due to) abuse.
: 這兩題給的答案都是due to
: 但是文法沒問題嗎？
: 從網路上找到關於due to的用法
: 它的前面不會是完整的主詞+動詞形成的句子
: 正確的例句像是 The crisis is due to poor organization.
: 大家對此有沒有什麼想法呢？