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The engineer ______my father works is about 50 years old.

A. to whom B. on whom C. with which D. with whom

The engineer ______my father works is about 50 years old.

A. to whom       B. on whom       C. with which  D. with whom

The engineer ______my father works is about 50 years old.

A. to whom B. on whom C. with which D. with whom

The engineer ______my father works is about 50 years old.

A. to whom 　　 B. on whom 　　 C. with which 　　 D. with whom

The engineer ______my father works is about 50 years old.

A. to whom 　 B. on whom 　 C. with which 　D. with whom

The engineer __________my father works is about 50 years old.?

A.to whom            B.on whom            C.with which         D.with whom?