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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单项选择题
The captain of the ship ______ the passengers that there was no danger.
A. assured
B. ensured
C. secured
D. insured
单项选择题
______ in a simple style, the book clearly describes the author's childhood experiences in a small town.
A. Writing
B. To be written
C. Being written
D. Written
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