3．他刚走进教室，这时铃声响了。

　　_______________________________________________________

　　4．汤姆去游泳，却不幸被淹死了。

　　_______________________________________________________

　　答案：A.1.must have been　2.If only　3.had almost reached; when　4.only to be scooped up

　　B．1.It must have rained last night, for the ground is wet.

　　2．If only I had taken his advice!

　　3．He had just entered the classroom when the bell rang.

　　4．Tom went to swim, only to be drowned.

　　.要点串记

　　运用所学语言基础知识，补充完整下面短文，并背诵之。

　　Davidson Black was a Canadian doctor who helped develop the techniques that 1.______ (导致) the discovery of the bones in the Zhoukoudian Caves, near Beijing. He was a 2.______ (专家) in the study of bones and found it challenging to 3.________ (寻找) and identify bones of early peoples. As the university in which he worked was aware of the 4.________ (重要意义) of his work, they gave him 5.________ (足够的) free time to do the research. And at last, it was his assistant, Pei Wenzhong, who made the discovery of these 6.________ (原始的) bones and 7.________ (削尖的) stone tools. Dr Davidson 8.________ (高度赞扬) Pei Wenzhong because of his talent and hard work.

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