【C11】A．beingB．beenC．areD．is

The president is believed__________ seriously ill．A.beingB.to beC.been##

Is the captain on board？ －－－ No, he _______ ashore.A.wentB.has beenC.has gone

He is talking so much about America as if he ____ there.A、had beenB、has beenC、wasD、been

Two hours _____ the limit of this test.A、areB、has beenC、will beD、is

【C18】A．is beingB．areC．have beenD．is

No one can prove that the earth _____ not round.A.is beingB.is to beC.isD.has been