Class regulations require is the last to leave the classroom off all the lights.A. who;

问题补充：

Class regulations require is the last to leave the classroom off all the lights.

A. who; should turn

B. whomever; turn

C. whoever; turning

D. whoever; turn

答案：

A. who; should turn

B. whomever; turn

C. whoever; turning

(答案→)D. whoever; turn

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