单项选择题

You can arrive in Beijing earlier for the meeting ______ you don't mind taking the night train.

A. if
B. unless
C. though
D. until
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单项选择题
When the millionaire died, his son was left an immense ______.
A. wealth
B. resource
C. pressure
D. luck
单项选择题
I have some difficulty ______ his heart disease.
A. treats
B. treating
C. treated
D. to treat
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