So quickly ______ their work that they were given a bonus.
A.
did the workmen finish
B.
the workmen finished
C.
the workmen finish
D.
do the workmen finish
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参考答案:
举一反三
【单选题】A is a sheet of paperboard that is folded over and glued against its edges forming a sleeve. The open ends of this sleeve can be closed off by dust flaps, reverse or straight tucks.