单项选择题

I had trouble ______ my car.

A. to start
B. to be starting
C. starting
D. to have started
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单项选择题
I think I saw Mary ______ in the library last night.
A. working
B. worked
C. to work
D. works
单项选择题
I went to the school with a view to ______ a visit to my former tutor.
A. pay
B. paying
C. have paid
D. being paid
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