i couldn't keep my tears back为什么是back，

i couldn't keep my tears back为什么是back， I couldn't keep back my tears any more请问这句子对吗? 50.I was so tired that I couldn't keep my eyes _____A.openingB.openC.openedD.to open I can't keep my eyes off i couldn't agree I couldn't help i couldn‘t是什么意思 I couldn't find my pen.I l______ it I keep my promise,don't keep your distant... I couldn't find my dog +anywhere 还是some where? I couldn't find my pen anywhere什么意思? i couldn't find my book everywhere/anywhere “i couldn't believe my eyes!the car was upside it was so cold that i couldn't feel my I couldn't find my voice.求 地道翻译 I couldn't find my English bool a_____. I couldn't bear the heavy shot in my hands. I ALMOST COULDN'T 还是I COULDN'T ALMOST?