I think you should complain ---________ of course, you are happy with the way things are.

I think you should complain, _____, of course, you are happy with the way things are.

I think you should complain —       ,of course, you are happy with the way things are.

A. if                              B. unless                    C. as                             D. because

I think you should complain—_________ , of course, you are happy with the way things are.

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

I think you should complain ---________ of course, you are happy with the way things are.

A．if                B．unless            C．as               D．because

I think you should complain, _____, of course, you are happy with the way things are.

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

I think you should complain —___________,of course, you are happy with the way things are.

         A．if         B．unless         C．as       D．because

I think you should complain —________, of course, you are happy with the way things are.

  A. if              B. unless         C. as       D. because

I think you should complain—       , of course, you are happy with the way things are.

A. if                    B. unless          C. as                 D. because

 I think you should complain, _____, of course, you are happy with the way things are.

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