.Threefourthsofthesurfaceofthe

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.Three-fourths of the surface of the earth_________sea.

A．is

B．are

C．were

D．has been

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32. Hardly ______ when the bus suddenly pulled away.

A．they had got to the bus stop	B．they got to the bus stop
C．did they get to the bus stop	D．had they got to the bus stop

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31. The room is in a terrible mess; it _______ cleaned.

A．can’t have been	B．shouldn’t have been
C．mustn’t have been	D．wouldn’t have been

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30. Please write a notice for the students and ______ .

A．put it up 　

B．put up it　

C．put it on 　

D．put on it

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29. If city noises____from increasing, people___shout to be heard even at the dinner table 20 years from now.

A．are not kept; will have to	B．are not kept; have to
C．do not kept; will have to	D．do not kept; have to

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28. The farm as well as its neighboring hills we once spent so much time ____ on a new look as recently as last year.

A．on having taken

B．has taken

C．on has taken

D．having taken

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