单项选择题

______ is your father, an engineer or a professor

A. Who

B. What

C. Which
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单项选择题
The young man over there is an ______.
[A] American
[B] European
[C] British
单项选择题
What would you do if you ______ live your life once again
[A] are able to
B. can
C. could
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