Class regulations require _____ is the last to leave the classroom _____ off all the lights.
A．who; should turnB．whom; shall turn
C．whomever; turnsD．whoever; turn
D
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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