Question

He has left out the most important reason why he         last night .

       A．stayed up            B．put up                C．picked up           D．kept up

Answer 1

A考查动词短语的用法。句意：他遗漏了他昨晚为什么熬夜这一最重要的原因。stay up       熬夜；put up张贴；支起；pick up捡起；接收；加速；习得等；keep up保持。