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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

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I felt very tired when I got home，and I ________ straight to bed. (2013·重庆，21)

A．go	B．went
C．had gone	D．have gone

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The girl has a great interest in sport and ________ badminton classes twice a week over the last three years. (2013·福建，26)

A．took	B．is taking
C．takes	D．has been taking

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—Oh no！We’re too late.The train________.
—That’s OK.We’ll catch the next train to London. (2013·山东，27)

A．was leaving	B．had left
C．has left	D．has been leaving

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—I don’t understand why you didn’t go to the lecture yesterday afternoon.
—I’m so sorry.But I________my homework. (2013·湖南，34)

A．had done	B．was doing
C．would do	D．am doing

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If nothing________，the oceans will turn into fish deserts. (2013·湖南，26)

A．does	B．had been done
C．will do	D．is done

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