单项选择题

(Hard) (as) he worked, (but) Mr. Brown couldn't (keep) the shop properly.

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