Question

-- Who do you think ___ the book here? --- It may be John. He was sitting here all t...

-- Who do you think ___ the book here? --- It may be John. He was sitting here all the morning. A．has left B．leaves C．had left D．was leaving

Answer 1

A

考查时态。句意：你认为是谁把书留在这儿了？——可能是约翰。整个上午他都坐在这儿。结合语境可知上文从句描述的是现在已经完成的动作，故用现在完成时态，选A。