单项选择题

A. No problem.
B. Many times.
C. I don’t know.
D. My pleasure.
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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
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
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