题干
— You should write a passage in the English exam.
— I think it's not difficult for us to write if you try your best.
A：70 words; 70 words
B：70-word; 70 words
C：70-word; 70-word
D：70 words; 70-word
答案(点此获取答案解析）
B
，则 
=（ ）