问题
选择题
In those days, books _____ one at a time by hand. [ ]
A. should be produced
B. should be produce
C. could be produced
D. could produce
答案
答案：C
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In those days, books _____ one at a time by hand. [ ]
A. should be produced
B. should be produce
C. could be produced
D. could produce
答案：C