In order to keep the balance of ecosystem, every possible means _______to deal with the problems of the over-exploiting of natural resources.
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A
has tried
B
has been tried
C
have taken
D
have been taken
推荐题目
Before coffee was introduced, Muslims used to drink a special kind of soup to _______ awake.
#100940
A
appear
B
prove
C
stay
D
feel
“What do you want to be?” asked Mrs. Crawford. “Oh, I ________ president,” said the boy, with a smile.
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A
have been
B
am
C
was
D
will be
—I am searching one online shopping site after another for a computer. —So __________I before I decided to buy a new camera.
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A
had
B
have
C
am
D
would
--Have you ever seen Peter recently?--Yes. He__________ me to ask you how you___________ along with your new job these days.
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A
has asked;have been getting
B
asked ;were getting
C
often asks;are getting
D
asked;are getting
Joy _______ as a language teacher in China for two years before she went back to London.
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A
had worked
B
was working
C
worked
D
has worked