Which connective should be put into the blank in order to show adversative relation between the following sentences? For the whole day he climbed up the steep mountainside, almost without stopping.__________ he was hardly aware of being tired.

Which connective should be put into the blank in order to show adversative relation between the following sentences? For the whole day he climbed up the steep mountainside, almost without stopping.__________ he was hardly aware of being tired.

A.Yet

B.And

C.So

D.Then

正确答案是A