单项选择题

When we walked (past) the theater, there were a lot of people (waited) (in) a long line outside the (box office).

A. past
B. waited
C. in
D. box office
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Several (people) in the crowd seemed (as) they were fighting (for) a (ticket).
A. people
B. as
C. for
D. ticket
单项选择题
(It is) (extremely) important (for) an engineer (to know) to use a computer.
A. It is
B. extremely
C. for
D. know
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