说明理由 1.Before the bridge-tunnel opened on October 31,2009,Ch

说明理由
1.Before the bridge-tunnel opened on October 31,2009,Chongming Island was only accessible ______ ferry.
A.to B.on C.in D.by
2.-Mary,now you have a chance to study in Singapore for a year as an exchange student.Are you interested?
-______ that be true?Of course I'll go.
A.May B.Might C.Can D.Must
3.Dried foods are invaluable to climbers,explorers and soldiers in battle,_____ little storage space.
A.which have B.which has C.who have D.that has