西藏正式成为中国的一个行政区是在() A.唐朝 B.北宋C.南宋 D.元朝
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The experiment _______ the discovery of a cure for cancer. A. happened to B. led up C. resulted inD. set up
I did not mean ____ anything, but those apples looked so good I couldn’t resist ___one. A. to eat…trying B. to eat…to trying C. eating…to try D. eating…to trying
向中国提出"门户开放"政策的国家是() A.英国 B.美国 C.俄国 D.日本