-- Who do you think ___ the book here?  
--- It may be John. He was sitting here all the morning.
A．has leftB．leavesC．had leftD．was leaving
A
考查時態(tài)。句意：你認為是誰把書留在這兒了？——可能是約翰。整個上午他都坐在這兒。結(jié)合語境可知上文從句描述的是現(xiàn)在已經(jīng)完成的動作，故用現(xiàn)在完成時態(tài)，選A。
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