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They kept trying _________ they must have known it was hopeless.

A. if         B. because       C. when   D. where

They kept trying _________ they must have known it was hopeless.

A. if       B. because      C. when  D. where

They kept trying _____ they must have known it was hopeless.

A. if       B. because

C. when  D. where

 They kept trying _________ they must have known it was hopeless.

A. if                               B. because                    C. when                       D. where

They kept trying _____ they must have known it was hopeless.

A. if　　　　　　　　　　　 B. because

C. when　　　　　　　　　　 D. where