You should write a position every other week.
A. three- thousand- word
B. three- thousands – word
C. three – thousand – words
D. three – thousands- words
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(答案→)A. three- thousand- word
B. three- thousands – word
C. three – thousand – words
D. three – thousands- words
解析：句意为：你每隔一周都应该写一篇3000字的作文。固定结构的考查，在数词+名词的结构中，名词应为单数形式，即答案为A。例如：a eighteen-year-old boy.