Uptonow,we____________ anynewsfromher.(haven'treceived, hadn't received)
查看答案
Ihadintendedtocallonyouyesterday,butsomeone ____________toseeme.(come, came)
WhenTomwasalittleboy,healreadyknewthesun ____________ thecenterofthesolarsystem.(is, was)
IhaveworkedheresinceI ____________fromcollege.(graduated, have graduated)
Bythetimeyougetback,greatchanges _____________ inthisarea.(will takeplace, will have taken place)