20.We have to say we are now facing unexpected difficulties ahead,but we firmly believe nothing can stop us from serving the people heart and soul,_________?( )
A. | can they | B. | can't it | C. | can it | D. | can't they |
19.Sorry,Madam.You'd better come tomorrow,because it's _________ the visiting hours now.( )
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A. | during | B. | at | C. | beyond | D. | before |