In writing a position, there must not be one sentence or even one word which is brought in .
A. at random
B. at ease
C. on purpose
D. at times
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(答案→)A. at random
B. at ease
C. on purpose
D. at times
解析：考查介词短语。A胡乱地；B自在，舒适；C故意的；D时而不时；根据句意可知D正确。句意：在写作为的时候，千万不能有一个句子或者单词是胡乱写的。