一题英语,还有一句翻译!
The new Hukou policy , according to some experts , ___ to attract more high-end talents to contribute to Shanghai's development.
A.serves B.serving C.to serve D.is served(要解析）
翻译这个句子：whichever gift you order from us is unique for the special person.
为什么选项前有逗号了却不能用非谓语,不能选b?