题目内容
（请给出正确答案）
The experts worked very hard to keep up______the latest development in their own fields.
A．with
B．from
C．on
D．by
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更多“The experts worked very hard t…”相关的问题
What does "meteorological experts "mean in paragraph three？ ______
A．predictors
B．witch
C．weathermen
D．a kind of Englishman
A.has worked
B.has been working
C.works
D.will have worked
Before the drug is used on human beings, experts have to ______ dogs.
A．be experimented
B．experiment
C．experiment with
D．experiment on
A.worked
B.should work
C.have worked
D.had worked
A.was; was
B.were; were
C.was ; were
D.were; was
What are the experts afraid will happen？
A．The Northern Pike will die.
B．The wells will be polluted.
C．Poisons will kill the Northern Pike.
D．The Northern Pike will swim into other lakes.
A. working
B.work
C. worked
D. have worked
A.also
B.or
C.but
B.been working
C.working
D.to be worked
Now I regret ______ worked harder at school.
A．not to have
B．not have
C．not having
D．having not
