leaves the room last ought to make sure that the windows are closed and the door locked.A

问题补充：

leaves the room last ought to make sure that the windows are closed and the door locked.

A. Whoever

B. Who

C. Who will

D. Those who

答案：

(答案→)A. Whoever

B. Who

C. Who will

D. Those who

解析：通过分析句子结构，可知这个句子中含有一个主语从句，且引导词在从句中作主语，表示任何一个人，故选A。

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