7、Every possible means ______ to prevent the air pollution, but the sky is still

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7、Every possible means ______ to prevent the air pollution, but the sky is still not clear.

A．is used

B．are used

C．has been used

D．have been used

答案

解析

略

举一反三

11． Nowadays，a large number of women，especially those who conicfromthe countryside，____in the clothing industry"．
A ．is working B．works C．work D worked

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12．______of the land in that district_____covered withtrees and grass.
A．Two-fifth；is B．Two-fifth；are C Two-fifths；is D Two-fifths；are

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15．A large____of money is spent on the Hope Project and a good inany schools____step．
A amount：has been B amount：have been
C．number；has been D deal；have been

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19.To play table tennis and to go swimming_____good for character training
A is B．are C was D were

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21． More than one high official_____by the police since the mayor war shot dead.

A．has been questioned	B．have been questioned
C．was questioned	D．were questioned

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