1.take trouble to do sth.费劲去做,专门去做，是词组，先去C，The great trouble he took toshow us how to run the machine/made him completely tired out./前面的是主语,made 谓语。所以D不对整个句子结构就是sth. make sb. +a.前后时态必须是一致的，而且B错在make 少了S2.定语从句中that 指代主语或宾语，你看从句中既没少主语也没少宾语，that显然不对
The great trouble he took to show us how to run the machine 是主语，The great trouble he took是主语的前半部分，to show us how to run the machine 是修饰部分，made是谓语，时态由句意可知。 that引导主语从句或者宾语从句，同位语从句，而此句中the last time 在后半句中不充当成分，所以要用when
