Where's Mike?He is working _____ physics A in;problem B out;problem C in;problems D on;problems

问题描述:

Where's Mike?He is working _____ physics A in;problem B out;problem C in;problems D on;problems

选D,Mike正在做物理题目,work out指的是结果,表示做出来了与现在进行时不符,work on则表示正在做物理题目与现在进行时相符.其他选择显而易见一定不对的