On the whole such a conclusion can be drawnwith a certain degree of confidence, but only if thechild can be assumed to have had the same attitudetowards the test as the other with whom he is beingcompared, and only if he was not punished by lack ofrelevant information which they possessed. 并列多重复合句。but连接两个并分句。 but 后面是两个并列的only if引导的条件状语从句