--- Whom shall I give the document?--- To ______ is in the office. However, ______ to require a written paper for itA.whom; make sureB.who; make sureC.whomever; be sureD.whoever; be sure
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D解析“我应该把文件给谁？”“谁在办公室就给谁。然而，要保证是用信纸写的。”句子缺少主语，故用who/whoever，排除A、C；make sure后常加that从句。be sure to do sth.“确保......”。故选D。