题目内容
It was after the invention of printing ________ to publish large numbers of books and pictures.
A.were people able
B.that people were able
C.when were people able
D.people were able
解析:
强调句型;强调部分是after the invention of printing后面接连词that以及句子的其他部分。正是在印刷术发明之后人类才能大量地出版图书。
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