B 选项是不是不全?
应该是 working on 或者 working at;
begin to do 和 begin doing 都可以的,但就这句而言,begin doing 更好,因为英语中有条规律：
doing 含有正在做或者已完成的意思；
而to do 含有尚未做的意思.
所以选B
Adam began( )the book in 1960 A:work on B:working C:to work
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