They kept trying _____ they must have known it was hopeless.A. if B. because C. when D. where

22.They kept trying _____ they must have known it was hopeless.为什么用WHEN? They kept trying _____ they must have known it was hopeless.A. if B. because C. when D. where They spoke so fast that I got rather ___(lose)trying to find the station. They spend what they could ___ words for their dictionaries.A trying to collect B to try to collect C trying colleting D to try collecting为什么啊 We are trying to protect them when they are in danger.We are ___ ___ ____ to protect them when they are in danger. Some frightening pets ___ be kept home so that they won't hurt others.Acan B.may C.must xxandxx kept trying to sit next to xx翻译 He kept __(run)after ,trying to catch her 选择：they are trying hard to raise money ___ the poor familythey are trying hard to raise money ___ the poor familyA.to B.for C.with D.as We are trying ___ (stop) the pollution. they were eagerly trying to buy They kept their plan dark.英译汉They kept their plan dark.译成汉语是何意? kept I was trying to daydream,but my mind kept wandering是什么意思 英语翻译别吵他,他要工作.___ ___ ___ ___ ,he is trying to work. Our room must ___ clean.A.keep B.be kept C.to be D.kept they just show that they are trying to be friendly提问that they are trying to be friendly 英语翻译they ___John ___ ___ ___.