两道英语单选,并解释1.We _with a number of plans and will give careful

两道英语单选,并解释
1.We _with a number of plans and will give careful consideration to all of them .
A .have been presented
B .are presenting
C .have presented
D .presented
2.--Take care !
--Nothing to worry about !I used to go hiking a lot ,so it wont be the first time I _alone go mountains .
A .had travelled
B .have travelled
C .was travelling
D .travelled