Dear teachers,<br/><br/>I have a question.<br/><br/>1. I can’t find my keys. I think they <u> </u> on the bus<br/><br/> (A)were left (B) have been left<br/><br/>Is (B) correct?<br/><br/>Or both of them are correct?<br/><br/>Please help me!!<br/><br/>Thanks a million!!!