D- means- no matter what he do
__has been done to improve his pronounciation,he find it dif
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He has done ______ to improve his English. [
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It is_____that he has been addicted to the drugs and has dif
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（）has recently been done to improve the conditions of elemen
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______has been done to improve the working conditions A,a lo
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_____has recently been done to improve the taxi service,we s
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__he entered the university,his english has been much improv
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I think he has tried his best to improve his handwriting,
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it has been done 谓语
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He was disappointed to find his suggestions ________. A．been
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done,tobe done,to have been done,to have done,having done,ha