Question

“ Although ,” the boy said , “ _______ over and over , the maths problem remained confusing to me ” .

A．explained	B．explain
C．explaining	D．having explained

Answer 1

A

试题分析：这题考查非谓语动词和省略式，当主从句的主语一致时，可以省略从句的主语和be动词，the boy said ,是插入语，暂且不看Although explained over and over=" Although" ,the maths problem was explained over and over，句意是：男孩说：虽然这个数学问题被解释了一遍又一遍，它对我来说还是不理解。选A。
点评：英语的省略式的一种就是从句的省略，条件是主从句的主语要一致，然后考虑谓语和逻辑主语的关系，决定是现在分词还是过去分词。