Few students can under the sentence until it --twice or thre

Few students can under the sentence until it --twice or thre Few students can understand the sentence until it（）twice or Few students can understand this problem until it-----twice Few students _____ homework once or twice a week Most students can't understand the sentence,so it wants ___o Believe it or not,none of the high school students can(/are Some students exercise once or twice a Until a few years age,only boys could become students at the The students exercise (once or twice) a week .(对画线提问） Translate the under sentence into chinese the book is very bad,and ----students like it.1,a few 2,few 英语翻译一年两或三次 为什么用 Two or three times a year 而不是用 twice or thre