many college students pay 800 to 1000 per year..per 是介词 能换成e

many college students pay 800 to 1000 per year..per 是介词 能换成e the course attracts 20 students per year,______up to half wi The course normally attracts 20 students per year,___up to h The course normally attracts 20 students per year,_______ up The course normally attracts 20 students per year,________ u there are many students can afford to pay for college tuitio how many pcs per bag?if change to 20 gross per box 求翻译 the course normally attracts 20 students per year__up to hal As per是介词词组吗?以及它的用法! 【求解释】The course normally attracts 20 students per year,____ The course normally attracts 20 students per year,of whose u Per是撒意思?