You can’t complain of being lonely         you don’t make any effort to communicate

with others.

A. when   B. until    C. unless  D. once  

You can’t complain of being lonely_______you don’t make any effort to communicate

with others.

A. when  B. until   C. unless D. once

You can’t complain of being lonely  ____   you don’t make any effort to communicate with others.

A. when   B. until     C. unless    D. once

28. You can’t complain of being lonely____you don’t make any effort to communicate with others.

A. when                B. until                        C. unless                      D. Once

You can’t complain of being lonely _______ you don’t make any effort to communicate with others．

A．when        B．until          C．unless        D．once