问题补充：
--- Whom shall I give the document?
--- To is in the office. However, to require a written paper for it.
A. whom; make sure
B. who; make sure
C. whomever; be sure
D. whoever; be sure
答案：
A. whom; make sure
B. who; make sure
C. whomever; be sure
(答案→)D. whoever; be sure
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。
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