单项选择题

______, I didn’t know how to use the machine.

[A] At beginning
B. At first
C. At start
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单项选择题
— Why won’t you go to the movie with me,Betty — Because I______it twice.
[A] saw
B. have seen
C. will see
单项选择题
I must first to find a room ______.
A. to live
B. to live in
C. living in
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