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单选(被动语态)

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In those days, books ______one at a time by hand. A. shold be produced B. shold be produce C. could be produced D. could produce
解题思路: 情态动词的被动语态 : could / should/ may /can + be done
解题过程:
In those days, books ______one at a time by hand.
A. shold be produced B. shold be produce
C. could be produced D. could produce
C 句意: 在那个时候,书籍只能用手工一次制作一本。 首先 根据句意可知,此句应该用被动语态,所以B、D 不正确;其次 ,could 能够;should 应该 (不合题意),所以选C。
记住:情态动词的被动语态 : could / should/ may /can + be done
最终答案:略