The gentleman ___ you told me yesterday proved to be a thief.
A. who
B. about whom
C. whom
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The doctor ___ you are looking for is in the room.
A. whom
B. what
C. which
The teacher for ____ you are waiting has come.
A. who
B. whom
C. that
child___parentsaredeadiscalledanorphan.
A. which
B. his
C. whose
Thisbookisforthestudents___native(本国的)languageisnotEnglish.
A. that
B. ofwhom
C. whose