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Doing your homework is a sure way to improve yor test scores, and this is especially true ____ it comes to classroom tests.

A. before     B. since    C. when   D. after

Doing your homework is a sure way to improve yor test scores, and this is especially true ____ it comes to classroom tests.

A. before  B. since    C. when   D. after

 Doing your homework is a sure way to improve yor test scores, and this is especially true ____ it comes to classroom tests.

A. before  B. since    C. when   D. after

Doing your homework is a sure way to improve yor test scores, and this is especially true ____ it comes to classroom tests.

A. before　　　 B. since　　　 C. when　　　 D. after