You must keep on working in the evening, ______ you are sure you can finish the task in time

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

You must keep on working in the evening________you are sure you can finish the task in time.

A．as                                                      B．if

C．when                                                 D．unless

 You must keep on working in the evening ______ you are sure you can finish the task in time.

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

You must keep on working in the evening ________ you are sure you can finish the task in time.

1. A.
   as
2. B.
   if
3. C.
   when
4. D.
   unless

You must keep on working in the evening, ______ you are sure you can finish the task in time

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

You must keep on working in the evening ______ you are sure you can finish the task in time.

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

You must keep on working in the evening, ______ you are sure you can finish the task in time.（ ）

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