Modern forms of transportation and communication have done much to ________the isolation  of life in Alaska.

Modern forms of transportation and communication have done much to ________the isolation  of life in Alaska.

A. break through?         B. break down       C.break into?????  D. break out

Modern forms of transportation and communication have done much to ________the isolation  of life in Alaska.

A. break through         B. break down       

C.break into  D. break out

Modern forms of transportation and communication have done much to ________the isolation  of life in Alaska.

Modern forms of transportation and communication have done much to ______ the isolation（隔离）of life in Alaska.