（The metal) aluminum （has been) （first) isolated （early) in the nineteenth century.A．The m

The watch __A.has foundB.has been foundC.have foundD.find

Almost all metals are good conductors, silver______ the best of all.A．isB．beingC．has beenD

"He has been to Paris" entailsA．He has been to France.B．Paris is the capital of France.C．H

●The project budget has been finalized.Additional work has been discovered that was not pl

The courageous boy has been the subject of mas

The English language has always changed but the rate of change has been uneven.A.portionB