Curiously enough這是副詞,作狀語.
動(dòng)詞開頭,可以用原形、不定式、動(dòng)名詞、現(xiàn)在分詞等.
Come to school on time.祈使句
Reading is important in learning a language.動(dòng)名詞
Seeing from the top of the hill,we can see the whole city clearly.現(xiàn)在分詞
To see is to believe=Seeing is believing.不定式/動(dòng)名詞.副詞開頭是作什么狀語呢？？副詞開頭是【強(qiáng)調(diào)該副詞】，同時(shí)，也用來作狀語，可以表示時(shí)間、地點(diǎn)、原因、方式、伴隨、比較、讓步等。這個(gè)句子中，Curiously enough表示【原因】，即做原因狀語，表明【he opened the box...】的原因。