______is on duty tonight must check that all the entrances are locked and the security alarm is set before leaving the building.

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问题 ______is on duty tonight must check that all the entrances are locked and the security alarm is set before leaving the building.

选项 A、That
B、Whoever
C、Someone
D、Whenever

答案B

解析 充当主语的名词性从句“______is…tonight”中主语成分空缺,故复合关系代词(B)Whoever为正确答案。(A)That只能引导完整的句子,故不正确。(C)Someone虽然意为“某些人”,但不能引导句子,所以也不正确。状语从句引导词(D)Whenever应接在成分完整的句子前,不能引导缺少主语的不完整的句子。
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