What _____the forests of the USA in the past 30 years? [ ]A. has happened

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What _____the forests of the USA in the past 30 years?    [     ]
A. has happened to
B. is happened to
C. has happened at
D. is happening

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举一反三

—Tom, why don"t you do your homework in your room?
—I _____it already.    [     ]
A. did
B. have done
C. do
D. will do

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—Tom, the workers _____our new library already.
—Really? I"ll go there and borrow some books.    [     ]
A. decorated
B. are decorating
C. have decorated
D. were decorated

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Our country_____rapidly in recent years, but she is still a _____ country.    [     ]
A. develops; developing
B. develops; developed
C. has developed; developing
D. has developed; developed

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Great changes_____ in his hometown since 1990.    [     ]
A. took place
B. take place
C. have taken place
D. were taken place

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—Kitty, will you go to see the film Iron ManⅡ this evening?
—No,  I won"t. I          it already.      [     ]
A. saw
B. have seen
C. see
D. will see

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