单项选择题

The old man has two daughters, ______ are doctors.

A. both of them
B. both of whom
C. both who
D. they both
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单项选择题
If you travel in a foreign country, a tour ______. may save you a lot of trouble.
A. director
B. helper
C. guide
D. assistant
单项选择题
A. The sales manager. B. The information officer. C. The office secretary. D. The chief engineer.
A. The sales manager.
B. The information officer.
C. The office secretary.
D. The chief engineer.
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