In writing a composition there must not be one sentence or even one word which is brought

问题补充：

In writing a composition, 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

答案：

(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。