Would you please turn the light because it's dark?A. onB. offC. upD. down

问题补充：

Would you please turn the light because its dark?

A. on

B. off

C. up

D. down

答案：

(答案→)A. on

B. off

C. up

D. down

解析：这里选on是由于它的原因状语从句是“因为天暗下来了，所以应该开灯了”。