2. Since the time humankind started gardening, we to make our environment more beautiful.
A. try B. have been trying
C. are trying D. will try
2. B考查動詞的時態。句霧：自人類開始園藝的時期起，我們就一直努力把我們的環境變得更加美好。根據since的提示可知用現在完成時，再根據語境可知，動作try從過去一直持續到現在，而且還要繼續進行下去，因此用現在完成進行時。
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3. During the Spring Festival,children ____________________ (玩得開心)each other.
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1. She someone, so I nodded to her and went away.
A. phoned B. had phoned
C. was phoning D. has phoned
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14. According to the art dealer， the painting to go for at least a million dollars.
A. is expected B. expects
C. expected D. is expecting
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13. ―The road repairs on 7th Avenue.
―OK. We'll take Park Avenue then.
A. are carrying out B. have been carried out
C. have carried out D. are being carried out
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7. ―Does your father smoke?
― ，it's two years since he .
A. Yes; smoked B. No; smoked
C. Yes; smokes D. No; has smoked
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19. Look ！ There is a whole crowd of people over there. Go and see what and if it is a bargain,buy it.
A. is selling B. has been selling
C. is being sold D. has been sold
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6. I to go to your party yesterday evening, but I had an unexpected visitor.
A. intended B. had intended
C. would intend D. would have intended
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4. [2014 •湖南卷〗Children, when by their parents, are allowed to enter the stadium.
A. to be accompanied
B. to accompany
C. accompanying
D. accompanied
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