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

A. who; should turn                B. whom; shall turn

C. whomever; turns                D. whoever; turn

D


解析:

考查名詞從句的連詞和虛擬語(yǔ)氣用法。主語(yǔ)從句中缺少主語(yǔ)，故用whoever=the person who, require后接賓語(yǔ)從句，句中動(dòng)詞用（should）do。

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